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1、SQL中,insert,delete,update,select后面都能带where子句
2、where子句语法
SELECT column_name FROM table_name WHERE column_name 运算符 value
没见过的运算符:
<>或!=:不等于
between and:SQL中相当于>=并且<=
where子句多条件查询:
SELECT column_name FROM table_name WHERE condition1 AND condition2 OR condition3