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MySQL SELECT 语句_MySQL

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Release: 2016-05-31 08:46:45
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SELECT语句:

products表如下:



a 从一个表中选出一列 :mysql> SELECT prod_name FROM products;



b 从表中检索多个列:mysql>SELECT prod_id, prod_name FROM products;



c 检索所有列:mysql> SELECT *  FROM products;//见第一幅图

d 检索不同行:mysql>SELECT DISTINCT prod_id FROM products;//当有多行产品id相同时,使用该语句时,多个相同的产品名称行,只显示一行。



e 限制结果 :mysql> SELECT prod_name FROM products LIMIT 5; // 显示前5行



f 使用完全限制名称:mysql> SELECT products.prod_id FROM lab.products;



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