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21 lines
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21 lines
1.9 KiB
HTML
<div class="m-bg">
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<h1>SQL IN 操作符</h1>
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<h2>IN 操作符</h2> <p>IN 操作符允许您在 WHERE 子句中规定多个值。</p> <h3>SQL IN 语法</h3> <div class="code notranslate"><pre><code class="language-sql"><div> SELECT <em>column_name(s)</em><br/> FROM <em>table_name</em><br/> WHERE <em>column_name</em> IN (<em>value1</em>,<em>value2</em>,...);</div></code></pre></div> <h2>演示数据库</h2> <p>在本教程中，我们将使用众所周知的 Northwind 样本数据库。</p> <p>下面是选自 "Customers" 表的数据：</p> <table class="reference notranslate">
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<tr>
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<th>CustomerID</th> <th>CustomerName</th> <th>ContactName</th> <th>Address</th> <th>City</th> <th>PostalCode</th> <th>Country</th> </tr>
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<tr>
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<td>1<br/><br/>
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</td> <td>Alfreds Futterkiste</td> <td>Maria Anders</td> <td>Obere Str. 57</td> <td>Berlin</td> <td>12209</td> <td>Germany</td> </tr>
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<tr>
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<td>2</td> <td>Ana Trujillo Emparedados y helados</td> <td>Ana Trujillo</td> <td>Avda. de la Constitución 2222</td> <td>México D.F.</td> <td>05021</td> <td>Mexico</td> </tr>
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<tr>
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<td>3</td> <td>Antonio Moreno Taquería</td> <td>Antonio Moreno</td> <td>Mataderos 2312</td> <td>México D.F.</td> <td>05023</td> <td>Mexico</td> </tr>
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<tr>
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<td>4<br/><br/>
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</td> <td>Around the Horn</td> <td>Thomas Hardy</td> <td>120 Hanover Sq.</td> <td>London</td> <td>WA1 1DP</td> <td>UK</td> </tr>
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<td>5</td> <td>Berglunds snabbköp</td> <td>Christina Berglund</td> <td>Berguvsvägen 8</td> <td>Luleå</td> <td>S-958 22</td> <td>Sweden</td> </tr>
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</table>
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<h2>IN 操作符实例</h2> <p>下面的 SQL 语句选取 City 为 "Paris" 或 "London" 的所有客户：</p> <div class="example margin-b-10"> <h2 class="example">实例</h2> <pre><code class="language-sql"><div class="example_code notranslate"> SELECT * FROM Customers<br/> WHERE City IN ('Paris','London'); </div></code></pre> </div> <div class="text-center padding-10 margin-t-5">
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