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查询将电话隐藏数据SELECT * FROM `student`idnamephone1张三丰132123456782灭绝师太132123456773扫地僧13212345676隐藏SELECT id, name, REPLACE(phone,SUBSTR(phone,4,4),'****') phone FROM `student`idnamephone1张三丰132****56782灭绝师太13

先统计当前日期一周七天的日期 select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 0 DAY) as weekday UNION select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) - 1 DAY) UNION select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) - 2 DAY) UNION select date_su..

使用 TIMESTAMPDIFF(YEAR,student.birthday,CURDATE())SELECT student.birthday, TIMESTAMPDIFF(YEAR,student.birthday,CURDATE()) as ageFROM student使用 ROUND(DATEDIFF(CURDATE(), student.birthday)/365.2422)SELECT student.birthday, ROUND(DATEDIFF(CURDATE.

首先创建数据库表SELECT * FROM student3idnameclassscore1张三语文902张三数学953张三英语804李四语文955李四数学856李四英语957王五语文758王五数学999王五英语85简单的查询语句(SELECT * FROM student3 WHERE class='语文' ORDER BY score desc limit..

查询数据库SELECT * FROM `student`查询结果idnamebirthday1张三1970-10-012李四1990-10-013王五2002-10-014马六2003-10-01转换为年龄的查询语句，使用函数TIMESTAMPDIFFSELECT id, name, birthday, TIMESTAMPDIFF(YEAR,student.birthday,CURDATE()) as age FROM `st..

数据库中存储的是个人的出生日期信息如何转换为个人的年龄信息呢？查询数据库SELECT * FROM `student`查询结果idnamebirthday1张三2000-10-012李四2001-10-013王五2002-10-01转换为年龄的查询语句，使用函数TIMESTAMPDIFFSELECT id, name, birthday, TIMESTAMPDIFF(YEAR,student.birthday,CURDATE()) a

正常情况下先将子查询进行排序，然后进行分组便可以取到组内的第一条数据但是在mysql5.7之后需要在子查询排序的时候加一个limit举个例子student表SELECT * FROM studentid name age gender1 张三丰 16 12 灭绝师太 17 03 扫地僧 18 14 杨逍 19 1按照gender进行分组，获取每个组内年龄最大的，很明显gender为1的age应该是19SELECT a.* FROM ( SELECT * FR.

首先student表idnameagegender1张三1712李四1613小美1504小红140查询SELECT GROUP_CONCAT(id) ids, GROUP_CONCAT(name) name, GROUP_CONCAT(age) age, genderFROM `student`WHERE gender=0结果idsnameagegender3,4小美,小红16,1

商品表：goodsSELECT * FROM `goods`idnamecolor_idstype_ids1铅笔1,2,31,22钢笔3,41,3颜色表：colorSELECT * FROM coloridcolor1黑色2白色3蓝色4紫色类型表：typeSELECT * from typeidtype1标配2标配+橡皮3标配+墨水多表查询：SE

使用between时，查询的结果是包含边界值的例如：select name, age from Student where age between 15 and 18这种时候查出来的信息中zge是 15、16、17、18使用not between时，结果是不包含边界值的例如：select name, age from Student where age not between 15 and 18这种时候查出来的信息中zge是 …13、14 和 19、20…...