23个MySQL常用查询语句 一查询数值型数据: SELECT * FROM tb_name WHERE sum > 100; 查询谓词:>,=,<,<>,!=,!>,!<,=>,=< 二查询字符串 SELECT * FROM tb_stu WHERE sname = '小刘' SELECT * FROM tb_stu WHERE sname like '刘%' SELECT * FROM tb_stu WHERE sname like '%…
关于MySQL常用的查询语句 一查询数值型数据: ; 查询谓词:>,=,<,<>,!=,!>,!<,=>,=< 二查询字符串 SELECT * FROM tb_stu WHERE sname = '小刘' SELECT * FROM tb_stu WHERE sname like '刘%' SELECT * FROM tb_stu WHERE sname like '%程序员' SELECT * FROM tb_stu WHERE sname like '%…
MySQL —— 简单查询与按条件查询 在MySQL中从数据表中查询数据的基本语句时select语句. select语句基本语法格式: select 查询内容 from 表名 where 表达式 group by 字段名 having 表达式 order by 字段名 limit 记录数每一个select语句由多个子句组成. 1. from 表名 指定是从那张表中查询 2. select 查询内容 查询所有字段 selec…
一查询数值型数据: SELECT * FROM tb_name WHERE sum > 100; 查询谓词:>,=,<,<>,!=,!>,!<,=>,=< 二查询字符串 SELECT * FROM tb_stu WHERE sname = '小刘' SELECT * FROM tb_stu WHERE sname like '刘%' SELECT * FROM tb_stu WHERE sname like '%程序员' SELECT * FR…