mysql查询语句最常用10个 mysql多表查询sql语句怎么写？
MySQL\u6700\u5e38\u7528\u7684\u51e0\u4e2a\u57fa\u672cSQL\u8bed\u53e5\u63d2\u5165\uff1ainsert into table1(field1,field2) values(value1,value2)
\u5220\u9664\uff1adelete from table1 where \u8303\u56f4
\u66f4\u65b0\uff1aupdate table1 set field1=value1 where \u8303\u56f4
\u67e5\u627e\uff1aselect * from table1 where field1 like \u2019%value1%\u2019 ---like\u7684\u8bed\u6cd5\u5f88\u7cbe\u5999\uff0c\u67e5\u8d44\u6599!
\u6392\u5e8f\uff1aselect * from table1 order by field1,field2 [desc]
\u603b\u6570\uff1aselect count as totalcount from table1
\u6c42\u548c\uff1aselect sum(field1) as sumvalue from table1
\u5e73\u5747\uff1aselect avg(field1) as avgvalue from table1
\u6700\u5927\uff1aselect max(field1) as maxvalue from table1
\u6700\u5c0f\uff1aselect min(field1) as minvalue from table1
（1）查询表中全部信息：
select * from 表名
（2）查询表中指定列的信息：
select 列1,列2 from 表名
（3）去重：
select distinct 列... from 表名
（4）拼接结果：
select concat(列1,列2) from 表名
（5）设置别名（注意：关键字as可以省略）
select 列 as 别名 from 表名
select 列 别名 from 表名
（6）条件查询：
select 列... from 表名 where 条件
条件中比较运算符：（等于:= 大于:> 大于等于:>= 小于:< 小于等于:<= 不等于:!= 或 <>）
（7）where 列 比较运算符 值
注意：字符串、日期需使用单引号括起来
（8）逻辑运算符（并且：and或&& 或：or 非：not或!）
where 条件1 逻辑运算符 条件2
where not 条件
（9）范围查询：
where 列 between 条件1 and 条件2; //列在这个区间的值where 列 not between 条件1 and 条件2; //不在这个区间where !( 列 between 条件1 and 条件2 ); //同样表示不在这个区间
集合查询（判断列的值是否在指定的集合中）：
where 列 in(值1,值2); //列中的数据是in后的值里面的where 列 not in(值1,值2); //不是in中指定值的数据
null值查询（注意：列中值为null不能使用=去查询）：
where 列 is null; //查询列中值为null的数据
资料来源 网页链接
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