MySQL学习4 数据过滤

and 和 or 操作符

例

select prod_name ,prod_price

form products

where vend_id =1002 or vend_id=1003 and prod_price >=10; #这样会先处理 and部分的内容，再处理or的内容

例2

select prod_name ,prod_price

form products

where( vend_id =1002 or vend_id=1003) and prod_price >=10;

in 操作符

select prod_name , prod_price

form products

where vend_id in (1002,1003) #会与括号中的值逐个匹配，实际效果与 where vend_id = 1002 or vend_id=1003一样

order by prod_name;

not操作符

not操作符就是否定后面的任何条件

select prod_name , prod_price

form products

where vend_id not in (1002,1003)

order by prod_name;