[IT学习]sql 入门及实例

2、从Customers 表中查询Country字段内容以U开头的记录。

SELECT * FROM Customers
WHERE Country like "U%";

3、从Customers 表中查询Country字段为USA，并且City字段内容为Seattle或者以P开头的记录。

SELECT * FROM Customers
where Country ="USA" and (City ="Seattle" or city like "P%");

4、从Customers 表中查询City字段内容不重复的记录内容，仅仅返回City字段。（Distinct用来返回字段唯一不重复值的命令）

SELECT DISTINCT City FROM Customers; 

5、Like 语句,S%,%S,%Sand%,分别表示S开头,S结尾,包含Sand

SELECT * FROM Customers
WHERE Country LIKE ‘%land%‘;

[IT学习]sql 入门及实例

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