Mysql 常用SQL语句集锦

来源：互联网发布：导入isp数据库编辑：程序博客网时间：2024/05/01 01:18

基础篇

//查询时间，友好提示$sql = "select date_format(create_time, '%Y-%m-%d') as day from table_name";

//int 时间戳类型$sql = "select from_unixtime(create_time, '%Y-%m-%d') as day from table_name";

//一个sql返回多个总数$sql = "select count(*) all, " ;$sql .= " count(case when status = 1 then status end) status_1_num, ";$sql .= " count(case when status = 2 then status end) status_2_num ";$sql .= " from table_name";

//Update Join / Delete Join$sql = "update table_name_1 ";$sql .= " inner join table_name_2 on table_name_1.id = table_name_2.uid ";$sql .= " inner join table_name_3 on table_name_3.id = table_name_1.tid ";$sql .= " set *** = *** ";$sql .= " where *** ";//delete join 同上。

//替换某字段的内容的语句$sql = "update table_name set content = REPLACE(content, 'aaa', 'bbb') ";$sql .= " where (content like '%aaa%')";

//获取表中某字段包含某字符串的数据$sql = "SELECT * FROM `表名` WHERE LOCATE('关键字', 字段名) ";

//获取字段中的前4位$sql = "SELECT SUBSTRING(字段名,1,4) FROM 表名 ";

//查找表中多余的重复记录//单个字段$sql = "select * from 表名 where 字段名 in ";$sql .= "(select 字段名 from 表名 group by 字段名 having count(字段名) > 1 )";//多个字段$sql = "select * from 表名 别名 where (别名.字段1,别名.字段2) in ";$sql .= "(select 字段1,字段2 from 表名 group by 字段1,字段2 having count(*) > 1 )";

//删除表中多余的重复记录(留id最小)//单个字段$sql = "delete from 表名 where 字段名 in ";$sql .= "(select 字段名 from 表名 group by 字段名 having count(字段名) > 1)  ";$sql .= "and 主键ID not in ";$sql .= "(select min(主键ID) from 表名 group by 字段名 having count(字段名 )>1) ";//多个字段$sql = "delete from 表名 别名 where (别名.字段1,别名.字段2) in ";$sql .= "(select 字段1,字段2 from 表名 group by 字段1,字段2 having count(*) > 1) ";$sql .= "and 主键ID not in ";$sql .= "(select min(主键ID) from 表名 group by 字段1,字段2 having count(*)>1) ";

业务篇

连续范围问题

//创建测试表CREATE TABLE `test_number` (  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,  `number` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '数字',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8

//创建测试数据insert into test_number values(1,1);insert into test_number values(2,2);insert into test_number values(3,3);insert into test_number values(4,5);insert into test_number values(5,7);insert into test_number values(6,8);insert into test_number values(7,10);insert into test_number values(8,11);

实验目标：求数字的连续范围。

根据上面的数据，应该得到的范围。

1-35-57-810-11

//执行Sqlselect min(number) start_range,max(number) end_rangefrom(    select number,rn,number-rn diff from    (        select number,@number:=@number+1 rn from test_number,(select @number:=0) as number    ) b) c group by diff;

签到问题

//创建参考表(模拟数据需要用到)CREATE TABLE `test_nums` (  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='参考表';//模拟数据，插入 1-10000 连续数据.

//创建测试表CREATE TABLE `test_sign_history` (  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,  `uid` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '用户ID',  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '签到时间',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='签到历史表';

//创建测试数据insert into test_sign_history(uid,create_time)select ceil(rand()*10000),str_to_date('2016-12-11','%Y-%m-%d')+interval ceil(rand()*10000) minutefrom test_nums where id<31;

//统计每天的每小时用户签到情况select    h,    sum(case when create_time='2016-12-11' then c else 0 end) 11Sign,    sum(case when create_time='2016-12-12' then c else 0 end) 12Sign,    sum(case when create_time='2016-12-13' then c else 0 end) 13Sign,    sum(case when create_time='2016-12-14' then c else 0 end) 14Sign,    sum(case when create_time='2016-12-15' then c else 0 end) 15Sign,    sum(case when create_time='2016-12-16' then c else 0 end) 16Sign,    sum(case when create_time='2016-12-17' then c else 0 end) 17Signfrom(    select        date_format(create_time,'%Y-%m-%d') create_time,        hour(create_time) h,        count(*) c    from test_sign_history    group by        date_format(create_time,'%Y-%m-%d'),        hour(create_time)) agroup by h with rollup;

//统计每天的每小时用户签到情况(当某个小时没有数据时，显示0)select    h ,    sum(case when create_time='2016-12-11' then c else 0 end) 11Sign,    sum(case when create_time='2016-12-12' then c else 0 end) 12Sign,    sum(case when create_time='2016-12-13' then c else 0 end) 13Sign,    sum(case when create_time='2016-12-14' then c else 0 end) 14Sign,    sum(case when create_time='2016-12-15' then c else 0 end) 15Sign,    sum(case when create_time='2016-12-16' then c else 0 end) 16Sign,    sum(case when create_time='2016-12-17' then c else 0 end) 17Signfrom(    select b.h h,c.create_time,c.c from     (        select id-1 h from test_nums where id<=24     ) b     left join     (        select         date_format(create_time,'%Y-%m-%d') create_time,         hour(create_time) h,         count(*) c        from test_sign_history        group by         date_format(create_time,'%Y-%m-%d'),         hour(create_time)      ) c on (b.h=c.h)) agroup by h with rollup;

//统计每天的用户签到数据和每天的增量数据select        type,        sum(case when create_time='2016-12-11' then c else 0 end) 11Sign,        sum(case when create_time='2016-12-12' then c else 0 end) 12Sign,        sum(case when create_time='2016-12-13' then c else 0 end) 13Sign,        sum(case when create_time='2016-12-14' then c else 0 end) 14Sign,        sum(case when create_time='2016-12-15' then c else 0 end) 15Sign,        sum(case when create_time='2016-12-16' then c else 0 end) 16Sign,        sum(case when create_time='2016-12-17' then c else 0 end) 17Signfrom(        select b.create_time,ifnull(b.c-c.c,0) c,'Increment' type from        (            select             date_format(create_time,'%Y-%m-%d') create_time,             count(*) c            from test_sign_history            group by             date_format(create_time,'%Y-%m-%d')        ) b        left join        (            select             date_format(create_time,'%Y-%m-%d') create_time,             count(*) c            from test_sign_history            group by             date_format(create_time,'%Y-%m-%d')        ) c on(b.create_time=c.create_time+ interval 1 day)    union all        select         date_format(create_time,'%Y-%m-%d') create_time,         count(*) c,         'Current'        from test_sign_history        group by         date_format(create_time,'%Y-%m-%d')) agroup by typeorder by case when type='Current' then 1 else 0 end desc;

//模拟不同的用户签到了不同的天数insert into test_sign_history(uid,create_time)select uid,create_time + interval ceil(rand()*10) day from test_sign_history,test_numswhere test_nums.id <10 order by rand() limit 150;

//统计签到天数相同的用户数量select    sum(case when day=1 then cn else 0 end) 1Day,    sum(case when day=2 then cn else 0 end) 2Day,    sum(case when day=3 then cn else 0 end) 3Day,    sum(case when day=4 then cn else 0 end) 4Day,    sum(case when day=5 then cn else 0 end) 5Day,    sum(case when day=6 then cn else 0 end) 6Day,    sum(case when day=7 then cn else 0 end) 7Day,    sum(case when day=8 then cn else 0 end) 8Day,    sum(case when day=9 then cn else 0 end) 9Day,    sum(case when day=10 then cn else 0 end) 10Dayfrom(    select c day,count(*) cn    from    (        select uid,count(*) c from test_sign_history group by uid    ) a    group by c) b;

//统计每个用户的连续签到时间select * from (    select d.*,    @ggid := @cggid,    @cggid := d.uid,    if(@ggid = @cggid, @grank := @grank + 1, @grank := 1) grank    from    (        select uid,min(c.create_time) begin_date ,max(c.create_time) end_date,count(*) count from        (            select            b.*,            @gid := @cgid,            @cgid := b.uid,            if(@gid = @cgid, @rank := @rank + 1, @rank := 1) rank,            b.diff-@rank flag from (                select                distinct                uid,                date_format(create_time,'%Y-%m-%d') create_time,                datediff(create_time,now()) diff                from test_sign_history order by uid,create_time            ) b, (SELECT @gid := 1, @cgid := 1, @rank := 1) as a        ) c group by uid,flag        order by uid,count(*) desc    ) d,(SELECT @ggid := 1, @cggid := 1, @grank := 1) as e)fwhere grank=1;

如果大家需要下载上述的相关数据表，进行测试。

可以关注微信公众号，回复 “签到数据表”，即可获取数据表。

本文地址： http://blog.csdn.net/aerchi/article/details/53735077

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