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<td align="center" valign="middle" class="til"><h3> sql表修改語句 </h3>
發布時間：2007-05-23 來源：本站 作者：佚名<br />
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</table><p>1.添加數據<br /><br />格式如圖1：</p>
<p>說明：<br />column_list列出要添加數據的列名。在給表或視圖中部分列添加數據時，必須使用該選項說明這部分列名。<br />DEFAULT VALUES說明向表中所有列插入其缺省值。對于具有INDENTITY屬性或timestamp數據類型的列，系統將自動插入下一個適當值。對于沒有設置缺省值的列，根據它們是否允許空值，將插入null或返回一錯誤信息。</p>
<p><img height="157" width="469" alt="" src="/upimg/allimg/070517/31.GIF" /></p>
<p>圖1</p>
<p>values_list的格式為：<br />VALUES(DEFAULT|constant_expression [,DEFAULT|constant_expression]......)</p>
<p>例1：<br />INSERT publisher<br />VALUES('9900','DELPHI','Beijing',null,'China')<br />例2：<br />INSERT publishers(pub_id,pub_name,contry,city)<br />VALUES('9900','DELPHI','China','Beijing')<br />例3：假定有兩個表tab1和tab2，它們列的排列順序分別為：col11,col2,col3和col1,col3,col2。這時，可使用現在兩種方法來實現數據拷貝：<br />INSERT tab1(col1,col3,col2)<br />SELECT * FROM tab2<br />或<br />INSERT tab1<br />SELECT col1,col2,col3 FROM tab2<br />2.修改數據</p>
<p><img height="177" width="498" alt="" src="/upimg/allimg/070517/32.GIF" /></p>
<p>SET子句指定被修改的列名及其新值，WHERE子句說明修改條件，指出表或視圖中的哪些行需要修改。<br />例1：使用SET子句將discounts表中所有行的discounts值增加0.1;<br />UPDATE discounts<br />SET discount=discount+0.1<br />例2：同時修改discounts表中折扣類型為volumn discount的lowqty可doscount列值：<br />UPDATE discounts<br />SET discount=discount+0.5,lowqty=lowqty+200<br />WHERE discounttype='volume discount'<br />3.刪除數據<br />DELETED和TRUNCATE TABLE語句都可以用來刪除表中的數據，DELETE語句的格式為：<br />DELETE [FROM] {table_name|view_name}<br />[WHERE clause]<br />TRUNCATE TABLE語句的格式為：<br />TRUNCATE TABLE [[database.]owner.]table_name<br />TRUNCATE TABLE語句刪除指定表中的所有數據行，但表結構及其所有索引繼續保留。<br />為該表所定義的約束、規則、缺省和觸發器仍然有效。如果所刪除表中包含有IDENTITY列，則該列將復位到它的原始基值。使用不帶WHERE子句的DELETE語句也可以刪除表中所有行，但它不復位IDENTITY列。<br />TRUNCATE TABLE不能刪除一個被其他表通過FOREIGN KEY約束所參照的表。<br />例1：<br />DELETE discounts<br />TRUNCATE TABLE discounts<br />例2：<br />DELETE titles<br />WHERE type='business'<br />例3：</p>
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<p>上一篇：<a href='/data/SQLServer/jc/200705/1176.htm'>sql 索引視圖</a> 下一篇：<a href='/data/SQLServer/jc/200705/1178.htm'>sql數據表</a> </p></td>
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