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<h2>Having</h2>
<p>
We can add expressions to the <em>having clause</em> when we use Dynamic formula, @Aggregation properties
or RawSql.
</p>
<p> </p>
<h3 id="dynamicFormula">Dynamic formula</h3>
<p>
See <a href="/docs/query/aggregation#dynamic">here </a> for more details on dynamic aggregation formula
(sum, min, max, count, avg).
</p>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="c1">// e.g. sum(hours)</span>
<span class="n">List</span><span class="o"><</span><span class="n">DMachineStats</span><span class="o">></span> <span class="n">result</span> <span class="o">=</span>
<span class="k">new</span> <span class="n">QDMachineStats</span><span class="o">()</span>
<span class="o">.</span><span class="na">select</span><span class="o">(</span><span class="s">"date, sum(totalKms), sum(hours)"</span><span class="o">)</span>
<span class="o">.</span><span class="na">havingClause</span><span class="o">()</span>
<span class="o">.</span><span class="na">gt</span><span class="o">(</span><span class="s">"sum(hours)"</span><span class="o">,</span> <span class="mi">2</span><span class="o">)</span> <span class="c1">// (1) having clause</span>
<span class="o">.</span><span class="na">findList</span><span class="o">();</span>
</pre></div>
</div>
<div class="syntax sql"><div class="highlight"><pre><span></span><span class="k">select</span> <span class="n">t0</span><span class="p">.</span><span class="nb">date</span><span class="p">,</span> <span class="k">sum</span><span class="p">(</span><span class="n">t0</span><span class="p">.</span><span class="n">total_kms</span><span class="p">),</span> <span class="k">sum</span><span class="p">(</span><span class="n">t0</span><span class="p">.</span><span class="n">hours</span><span class="p">)</span>
<span class="k">from</span> <span class="n">d_machine_stats</span> <span class="n">t0</span>
<span class="k">group</span> <span class="k">by</span> <span class="n">t0</span><span class="p">.</span><span class="nb">date</span>
<span class="k">having</span> <span class="k">sum</span><span class="p">(</span><span class="n">t0</span><span class="p">.</span><span class="n">hours</span><span class="p">)</span> <span class="o">></span> <span class="o">?</span> <span class="c1">-- (1) having clause</span>
</pre></div>
</div>
<p> </p>
<h3 id="atAggregation">@Aggration</h3>
<p>
With <em>@Aggration</em> and <em>@Sum</em> properties these are properties on the query bean
so we just use them as normal but after <code>having()</code>.
</p>
<h5>Example:</h5>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="nd">@Entity</span>
<span class="nd">@Table</span><span class="o">(</span><span class="nx">name</span> <span class="o">=</span> <span class="s">"orders"</span><span class="o">)</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">Order</span> <span class="kd">extends</span> <span class="n">BaseModel</span> <span class="o">{</span>
<span class="o">...</span>
<span class="n">LocalDate</span> <span class="n">orderDate</span><span class="o">;</span>
<span class="nd">@Aggregation</span><span class="o">(</span><span class="s">"max(orderDate)"</span><span class="o">)</span> <span class="c1">// aggregation property</span>
<span class="n">LocalDate</span> <span class="n">maxOrderDate</span><span class="o">;</span>
<span class="nd">@Aggregation</span><span class="o">(</span><span class="s">"count(*)"</span><span class="o">)</span> <span class="c1">// aggregation property</span>
<span class="n">Long</span> <span class="n">totalCount</span><span class="o">;</span>
</pre></div>
</div>
<p>
So we can use <em>maxOrderDate</em> and <em>totalCount</em> properties like other query bean properties.
Add predicates on these aggregation properties to the having clause like:
</p>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="n">List</span><span class="o"><</span><span class="n">Order</span><span class="o">></span> <span class="n">orders</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QOrder</span><span class="o">()</span>
<span class="o">.</span><span class="na">select</span><span class="o">(</span><span class="n">o</span><span class="o">.</span><span class="na">status</span><span class="o">,</span> <span class="n">o</span><span class="o">.</span><span class="na">maxOrderDate</span><span class="o">,</span> <span class="n">o</span><span class="o">.</span><span class="na">totalCount</span><span class="o">)</span>
<span class="o">.</span><span class="na field">status</span><span class="o">.</span><span class="na">notEqualTo</span><span class="o">(</span><span class="n">Order</span><span class="o">.</span><span class="na field">Status</span><span class="o">.</span><span class="na">COMPLETE</span><span class="o">)</span> <span class="c1">// (1) where clause - non aggregate properties</span>
<span class="o">.</span><span class="na">having</span><span class="o">()</span>
<span class="o">.</span><span class="na field">totalCount</span><span class="o">.</span><span class="na">greaterThan</span><span class="o">(</span><span class="mi">1</span><span class="o">)</span> <span class="c1">// (2) having clause - aggregate properties</span>
<span class="o">.</span><span class="na">findList</span><span class="o">();</span>
</pre></div>
</div>
<div class="syntax sql"><div class="highlight"><pre><span></span><span class="k">select</span> <span class="n">t0</span><span class="p">.</span><span class="n">status</span><span class="p">,</span> <span class="k">max</span><span class="p">(</span><span class="n">t0</span><span class="p">.</span><span class="n">order_date</span><span class="p">),</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="k">from</span> <span class="n">orders</span> <span class="n">t0</span>
<span class="k">where</span> <span class="n">t0</span><span class="p">.</span><span class="n">status</span> <span class="o"><></span> <span class="o">?</span> <span class="o">//</span> <span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="k">group</span> <span class="k">by</span> <span class="n">t0</span><span class="p">.</span><span class="n">status</span>
<span class="k">having</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span> <span class="o">></span> <span class="o">?</span> <span class="o">//</span> <span class="p">(</span><span class="mi">2</span><span class="p">)</span>
</pre></div>
</div>
<p> </p>
<h3 id="rawSql">RawSql</h3>
<p>
With parsed RawSql we can also add expressions to the having clause.
</p>
<h5>Example</h5>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="n">String</span> <span class="n">sql</span> <span class="o">=</span>
<span class="s">"select order_id, count(*) as totalItems, sum(order_qty*unit_price) as totalAmount \n"</span> <span class="o">+</span>
<span class="s">"from o_order_detail \n"</span> <span class="o">+</span>
<span class="s">"group by order_id"</span><span class="o">;</span>
<span class="n">RawSql</span> <span class="n">rawSql</span> <span class="o">=</span> <span class="n">RawSqlBuilder</span><span class="o">.</span><span class="na">parse</span><span class="o">(</span><span class="n">sql</span><span class="o">).</span><span class="na">columnMapping</span><span class="o">(</span><span class="s">"order_id"</span><span class="o">,</span> <span class="s">"order.id"</span><span class="o">).</span><span class="na">create</span><span class="o">();</span>
<span class="n">List</span><span class="o"><</span><span class="n">OrderAggregate</span><span class="o">></span> <span class="n">l2</span> <span class="o">=</span> <span class="n">DB</span><span class="o">.</span><span class="na">find</span><span class="o">(</span><span class="n">OrderAggregate</span><span class="o">.</span><span class="na">class</span><span class="o">)</span>
<span class="o">.</span><span class="na">setRawSql</span><span class="o">(</span><span class="n">rawSql</span><span class="o">)</span>
<span class="o">.</span><span class="na">where</span><span class="o">()</span>
<span class="o">.</span><span class="na">gt</span><span class="o">(</span><span class="s">"order.id"</span><span class="o">,</span> <span class="mi">0</span><span class="o">)</span>
<span class="o">.</span><span class="na">having</span><span class="o">()</span> <span class="c1">// having clause</span>
<span class="o">.</span><span class="na">lt</span><span class="o">(</span><span class="s">"totalItems"</span><span class="o">,</span> <span class="mi">3</span><span class="o">)</span>
<span class="o">.</span><span class="na">gt</span><span class="o">(</span><span class="s">"totalAmount"</span><span class="o">,</span> <span class="mi">50</span><span class="o">)</span>
<span class="o">.</span><span class="na">findList</span><span class="o">();</span>
</pre></div>
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