uTools-Manuals/docs/sql/INSERT INTO SELECT 语句.html

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<h1>SQL INSERT INTO SELECT 语句</h1>
<p class="intro">通过 SQL，您可以从一个表复制信息到另一个表。</p> <p class="intro">INSERT INTO SELECT 语句从一个表复制数据，然后把数据插入到一个已存在的表中。</p> <h2>SQL INSERT INTO SELECT 语句</h2> <p>INSERT INTO SELECT 语句从一个表复制数据，然后把数据插入到一个已存在的表中。目标表中任何已存在的行都不会受影响。</p> <h3>SQL INSERT INTO SELECT 语法</h3> <p>我们可以从一个表中复制所有的列插入到另一个已存在的表中：</p> <div class="code notranslate"><pre><code class="language-sql"><div> INSERT INTO <em>table2</em><br/> SELECT * FROM <em>table1;</em> </div></code></pre></div> <p>或者我们可以只复制希望的列插入到另一个已存在的表中：</p> <div class="code notranslate"><pre><code class="language-sql"><div> INSERT INTO <em>table2</em><br/><em>(column_name(s))</em><br/> SELECT <em>column_name(s)</em><br/> FROM <em>table1;</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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<th width="15%">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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<td>1<br/><br/>
</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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<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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<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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<p>选自 "Suppliers" 表的数据：</p> <table class="reference notranslate">
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<th>SupplierID</th> <th>SupplierName</th> <th>ContactName</th> <th>Address</th> <th>City</th> <th>Postal Code</th> <th>Country</th> <th>Phone</th> </tr>
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<td>1</td> <td>Exotic Liquid</td> <td>Charlotte Cooper</td> <td>49 Gilbert St.</td> <td>Londona</td> <td>EC1 4SD</td> <td>UK</td> <td>(171) 555-2222</td> </tr>
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<td>2</td> <td>New Orleans Cajun Delights</td> <td>Shelley Burke</td> <td>P.O. Box 78934</td> <td>New Orleans</td> <td>70117</td> <td>USA</td> <td>(100) 555-4822</td> </tr>
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<td>3</td> <td>Grandma Kelly's Homestead</td> <td>Regina Murphy</td> <td>707 Oxford Rd.</td> <td>Ann Arbor</td> <td>48104</td> <td>USA</td> <td>(313) 555-5735</td> </tr>
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<h2>SQL INSERT INTO SELECT 实例</h2> <p>只复制 "Suppliers" 中的一些列插入到 "Customers" 中：</p> <div class="example margin-b-10"> <h2 class="example">实例</h2> <pre><code class="language-sql"><div class="example_code notranslate"> INSERT INTO Customers (CustomerName, Country)<br/> SELECT SupplierName, Country FROM Suppliers; </div></code></pre> </div> <p>只复制德国的供应商插入到 "Customers" 中：</p> <div class="example margin-b-10"> <h2 class="example">实例</h2> <pre><code class="language-sql"><div class="example_code notranslate"> INSERT INTO Customers (CustomerName, Country)<br/> SELECT SupplierName, Country FROM Suppliers<br/>WHERE Country='Germany'; </div></code></pre> </div> <div class="text-center padding-10 margin-t-5">
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