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working on sqlalchemy examples
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‎content/pages/examples/sqlalchemy/sqlalchemy-databases-mysql.markdown‎

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title: sqlalchemy.databases mysql Example Code
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category: page
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slug: sqlalchemy-databases-mysql-examples
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sortorder: 500031000
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toc: False
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sidebartitle: sqlalchemy.databases mysql
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meta: Python example code that shows how to use the mysql callable from the sqlalchemy.databases module of the SQLAlchemy project.
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`mysql` is a callable within the `sqlalchemy.databases` module of the SQLAlchemy project.
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## Example 1 from PyHive
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[PyHive](https://github.com/dropbox/PyHive)
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([PyPI package information](https://pypi.org/project/PyHive/))
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is a set of [DB-API](https://www.python.org/dev/peps/pep-0249/)
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and
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[SQLAlchemy](/sqlalchemy.html)
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interfaces that make it easier to use [Presto](https://prestodb.io/)
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and [Apache Hive](http://hive.apache.org/) with Python.
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[Dropbox's engineering team](https://www.dropbox.com/jobs/teams/engineering)
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created this code library, open sourced it and put it out under
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the [Apache 2.0 license](https://github.com/dropbox/PyHive/blob/master/LICENSE).
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[**PyHive / pyhive / sqlalchemy_presto.py**](https://github.com/dropbox/PyHive/blob/master/pyhive/./sqlalchemy_presto.py)
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```python
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# sqlalchemy_presto.py
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from __future__ import absolute_import
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from __future__ import unicode_literals
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import re
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from sqlalchemy import exc
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from sqlalchemy import types
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from sqlalchemy import util
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~~from sqlalchemy.databases import mysql
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from sqlalchemy.engine import default
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from sqlalchemy.sql import compiler
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from sqlalchemy.sql.compiler import SQLCompiler
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from pyhive import presto
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from pyhive.common import UniversalSet
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class PrestoIdentifierPreparer(compiler.IdentifierPreparer):
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reserved_words = UniversalSet()
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_type_map = {
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'boolean': types.Boolean,
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~~ 'tinyint': mysql.MSTinyInteger,
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'smallint': types.SmallInteger,
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'integer': types.Integer,
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'bigint': types.BigInteger,
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'real': types.Float,
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'double': types.Float,
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'varchar': types.String,
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'timestamp': types.TIMESTAMP,
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'date': types.DATE,
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'varbinary': types.VARBINARY,
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}
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class PrestoCompiler(SQLCompiler):
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def visit_char_length_func(self, fn, **kw):
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return 'length{}'.format(self.function_argspec(fn, **kw))
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class PrestoTypeCompiler(compiler.GenericTypeCompiler):
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def visit_CLOB(self, type_, **kw):
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raise ValueError("Presto does not support the CLOB column type.")
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def visit_NCLOB(self, type_, **kw):
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raise ValueError("Presto does not support the NCLOB column type.")
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## ... source file continues with no further mysql examples...
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```
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‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-mssql.markdown‎

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title: sqlalchemy.dialects mssql Example Code
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category: page
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slug: sqlalchemy-dialects-mssql-examples
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sortorder: 500031000
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sortorder: 500031001
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toc: False
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sidebartitle: sqlalchemy.dialects mssql
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meta: Python example code that shows how to use the mssql callable from the sqlalchemy.dialects module of the SQLAlchemy project.
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mssql is a callable within the sqlalchemy.dialects module of the SQLAlchemy project.
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`mssql` is a callable within the `sqlalchemy.dialects` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-mysql-examples.html">mysql</a>,
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<a href="/sqlalchemy-dialects-oracle-examples.html">oracle</a>,
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<a href="/sqlalchemy-dialects-postgresql-examples.html">postgresql</a>,
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and <a href="/sqlalchemy-dialects-sqlite-examples.html">sqlite</a>
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are several other callables with code examples from the same `sqlalchemy.dialects` package.
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## Example 1 from marshmallow-sqlalchemy
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[marshmallow-sqlalchemy](https://github.com/marshmallow-code/marshmallow-sqlalchemy)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-mysql-pymysql.markdown‎

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title: sqlalchemy.dialects.mysql pymysql Example Code
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category: page
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slug: sqlalchemy-dialects-mysql-pymysql-examples
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sortorder: 500031005
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sortorder: 500031006
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toc: False
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sidebartitle: sqlalchemy.dialects.mysql pymysql
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meta: Python example code that shows how to use the pymysql callable from the sqlalchemy.dialects.mysql module of the SQLAlchemy project.
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pymysql is a callable within the sqlalchemy.dialects.mysql module of the SQLAlchemy project.
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`pymysql` is a callable within the `sqlalchemy.dialects.mysql` module of the SQLAlchemy project.
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## Example 1 from databases

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-mysql.markdown‎

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title: sqlalchemy.dialects mysql Example Code
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category: page
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slug: sqlalchemy-dialects-mysql-examples
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sortorder: 500031001
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sortorder: 500031002
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toc: False
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sidebartitle: sqlalchemy.dialects mysql
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meta: Python example code that shows how to use the mysql callable from the sqlalchemy.dialects module of the SQLAlchemy project.
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mysql is a callable within the sqlalchemy.dialects module of the SQLAlchemy project.
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`mysql` is a callable within the `sqlalchemy.dialects` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-mssql-examples.html">mssql</a>,
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<a href="/sqlalchemy-dialects-oracle-examples.html">oracle</a>,
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<a href="/sqlalchemy-dialects-postgresql-examples.html">postgresql</a>,
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and <a href="/sqlalchemy-dialects-sqlite-examples.html">sqlite</a>
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are several other callables with code examples from the same `sqlalchemy.dialects` package.
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## Example 1 from marshmallow-sqlalchemy
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[marshmallow-sqlalchemy](https://github.com/marshmallow-code/marshmallow-sqlalchemy)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-oracle.markdown‎

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title: sqlalchemy.dialects oracle Example Code
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category: page
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slug: sqlalchemy-dialects-oracle-examples
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sortorder: 500031002
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sortorder: 500031003
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toc: False
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sidebartitle: sqlalchemy.dialects oracle
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meta: Python example code that shows how to use the oracle callable from the sqlalchemy.dialects module of the SQLAlchemy project.
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oracle is a callable within the sqlalchemy.dialects module of the SQLAlchemy project.
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`oracle` is a callable within the `sqlalchemy.dialects` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-mssql-examples.html">mssql</a>,
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<a href="/sqlalchemy-dialects-mysql-examples.html">mysql</a>,
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<a href="/sqlalchemy-dialects-postgresql-examples.html">postgresql</a>,
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and <a href="/sqlalchemy-dialects-sqlite-examples.html">sqlite</a>
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are several other callables with code examples from the same `sqlalchemy.dialects` package.
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## Example 1 from sqlalchemy-utils
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[sqlalchemy-utils](https://github.com/kvesteri/sqlalchemy-utils)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-postgresql-array.markdown‎

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title: sqlalchemy.dialects.postgresql ARRAY Example Code
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category: page
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slug: sqlalchemy-dialects-postgresql-array-examples
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sortorder: 500031007
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toc: False
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sidebartitle: sqlalchemy.dialects.postgresql ARRAY
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meta: Python example code that shows how to use the ARRAY constant from the sqlalchemy.dialects.postgresql module of the SQLAlchemy project.
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ARRAY is a constant within the sqlalchemy.dialects.postgresql module of the SQLAlchemy project.
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`ARRAY` is a constant within the `sqlalchemy.dialects.postgresql` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-postgresql-bigint-examples.html">BIGINT</a>,
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<a href="/sqlalchemy-dialects-postgresql-bit-examples.html">BIT</a>,
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<a href="/sqlalchemy-dialects-postgresql-double-precision-examples.html">DOUBLE_PRECISION</a>,
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<a href="/sqlalchemy-dialects-postgresql-excludeconstraint-examples.html">ExcludeConstraint</a>,
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<a href="/sqlalchemy-dialects-postgresql-integer-examples.html">INTEGER</a>,
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<a href="/sqlalchemy-dialects-postgresql-json-examples.html">JSON</a>,
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<a href="/sqlalchemy-dialects-postgresql-tsvector-examples.html">TSVECTOR</a>,
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<a href="/sqlalchemy-dialects-postgresql-array-examples.html">array</a>,
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<a href="/sqlalchemy-dialects-postgresql-json-examples.html">json</a>,
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and <a href="/sqlalchemy-dialects-postgresql-pypostgresql-examples.html">pypostgresql</a>
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are several other callables with code examples from the same `sqlalchemy.dialects.postgresql` package.
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## Example 1 from sqlacodegen
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[sqlacodegen](https://github.com/agronholm/sqlacodegen)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-postgresql-base-pgcompiler.markdown‎

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title: sqlalchemy.dialects.postgresql.base PGCompiler Example Code
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category: page
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slug: sqlalchemy-dialects-postgresql-base-pgcompiler-examples
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sortorder: 500031015
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sortorder: 500031016
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toc: False
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sidebartitle: sqlalchemy.dialects.postgresql.base PGCompiler
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meta: Example code for understanding how to use the PGCompiler class from the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.
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PGCompiler is a class within the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.
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`PGCompiler` is a class within the `sqlalchemy.dialects.postgresql.base` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-postgresql-base-pgidentifierpreparer-examples.html">PGIdentifierPreparer</a>
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and
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<a href="/sqlalchemy-dialects-postgresql-base-pgtypecompiler-examples.html">PGTypeCompiler</a>
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are a couple of other callables within the `sqlalchemy.dialects.postgresql.base` package that also have code examples.
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## Example 1 from sqlalchemy-clickhouse
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[sqlalchemy-clickhouse](https://github.com/cloudflare/sqlalchemy-clickhouse)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-postgresql-base-pgidentifierpreparer.markdown‎

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title: sqlalchemy.dialects.postgresql.base PGIdentifierPreparer Example Code
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category: page
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slug: sqlalchemy-dialects-postgresql-base-pgidentifierpreparer-examples
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sortorder: 500031016
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sortorder: 500031017
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toc: False
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sidebartitle: sqlalchemy.dialects.postgresql.base PGIdentifierPreparer
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meta: Example code for understanding how to use the PGIdentifierPreparer class from the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.
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PGIdentifierPreparer is a class within the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.
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`PGIdentifierPreparer` is a class within the `sqlalchemy.dialects.postgresql.base` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-postgresql-base-pgcompiler-examples.html">PGCompiler</a>
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and
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<a href="/sqlalchemy-dialects-postgresql-base-pgtypecompiler-examples.html">PGTypeCompiler</a>
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are a couple of other callables within the `sqlalchemy.dialects.postgresql.base` package that also have code examples.
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## Example 1 from sqlalchemy-clickhouse
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[sqlalchemy-clickhouse](https://github.com/cloudflare/sqlalchemy-clickhouse)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-postgresql-base-pgtypecompiler.markdown‎

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title: sqlalchemy.dialects.postgresql.base PGTypeCompiler Example Code
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category: page
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slug: sqlalchemy-dialects-postgresql-base-pgtypecompiler-examples
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sortorder: 500031017
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sortorder: 500031018
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toc: False
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sidebartitle: sqlalchemy.dialects.postgresql.base PGTypeCompiler
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meta: Example code for understanding how to use the PGTypeCompiler class from the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.
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PGTypeCompiler is a class within the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.
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`PGTypeCompiler` is a class within the `sqlalchemy.dialects.postgresql.base` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-postgresql-base-pgcompiler-examples.html">PGCompiler</a>
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and
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<a href="/sqlalchemy-dialects-postgresql-base-pgidentifierpreparer-examples.html">PGIdentifierPreparer</a>
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are a couple of other callables within the `sqlalchemy.dialects.postgresql.base` package that also have code examples.
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## Example 1 from sqlalchemy-utils
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[sqlalchemy-utils](https://github.com/kvesteri/sqlalchemy-utils)

‎content/pages/examples/sqlalchemy/sqlalchemy-dialects-postgresql-bigint.markdown‎

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title: sqlalchemy.dialects.postgresql BIGINT Example Code
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category: page
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slug: sqlalchemy-dialects-postgresql-bigint-examples
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sortorder: 500031008
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toc: False
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sidebartitle: sqlalchemy.dialects.postgresql BIGINT
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meta: Python example code that shows how to use the BIGINT constant from the sqlalchemy.dialects.postgresql module of the SQLAlchemy project.
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BIGINT is a constant within the sqlalchemy.dialects.postgresql module of the SQLAlchemy project.
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`BIGINT` is a constant within the `sqlalchemy.dialects.postgresql` module of the SQLAlchemy project.
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<a href="/sqlalchemy-dialects-postgresql-array-examples.html">ARRAY</a>,
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<a href="/sqlalchemy-dialects-postgresql-bit-examples.html">BIT</a>,
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<a href="/sqlalchemy-dialects-postgresql-double-precision-examples.html">DOUBLE_PRECISION</a>,
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<a href="/sqlalchemy-dialects-postgresql-excludeconstraint-examples.html">ExcludeConstraint</a>,
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<a href="/sqlalchemy-dialects-postgresql-integer-examples.html">INTEGER</a>,
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<a href="/sqlalchemy-dialects-postgresql-json-examples.html">JSON</a>,
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<a href="/sqlalchemy-dialects-postgresql-tsvector-examples.html">TSVECTOR</a>,
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<a href="/sqlalchemy-dialects-postgresql-array-examples.html">array</a>,
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<a href="/sqlalchemy-dialects-postgresql-json-examples.html">json</a>,
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and <a href="/sqlalchemy-dialects-postgresql-pypostgresql-examples.html">pypostgresql</a>
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are several other callables with code examples from the same `sqlalchemy.dialects.postgresql` package.
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## Example 1 from alembic
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[Alembic](https://github.com/sqlalchemy/alembic)

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