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  • mysql count group by统计条数方法mysql 分组之后如何统计记录条数 mysql 分组之后如何统计记录条数 mysql 分组之后如何统计记录条数? gourp by 之后的 count, 把group by查询结果当成一个表再count一次 select ...

    mysql count group by统计条数方法

    mysql 分组之后如何统计记录条数

    mysql 分组之后如何统计记录条数? gourp by 之后的 count,
    把group by查询结果当成一个表再count一次

    select count(*) as count from
    (SELECT count(*) FROM 表名 WHERE 条件 GROUP BY id ) a;
    

    实战例子:

    select
    count(*) as total
    from (select count(*) from users group by user_id) u 
    
    展开全文
  • mysql count group by统计条数方法

    万次阅读 2018-11-07 10:32:19
    mysql count group by统计条数方法 mysql 分组之后如何统计记录条数? gourp by 之后的 count,把group by查询结果当成一个表再count一次 select count(*) as count from (SELECT count(*) FROM 表名 WHERE 条件 ...

    mysql count group by统计条数方法

    mysql 分组之后如何统计记录条数? gourp by 之后的 count,把group by查询结果当成一个表再count一次
    select count(*) as count from
    (SELECT count(*) FROM 表名 WHERE 条件 GROUP BY id ) a;

    实战例子:
    select 
    count(*) as total 
    from (select count(*) from users group by user_id) u

     

    转载:流风,飘然的风,博客网站:http://www.ssqhm.com

    展开全文
  • MySQL分组后,统计记录条数的方法:1、统计记录条数,代码为【SELECT num,count(*) AS counts from test_a GROUP BY num】;2、对num去重后的数量的统计。MySQL分组后,统计记录条数的方法:分组后,统计记录条数:...

    MySQL分组后,统计记录条数的方法:1、统计记录条数,代码为【SELECT num,count(*) AS counts from test_a GROUP BY num】;2、对num去重后的数量的统计。

    2020102315533384267.jpg

    MySQL分组后,统计记录条数的方法:

    分组后,统计记录条数:SELECT num,count(*) AS counts from test_a GROUP BY num;

    查询结果如下:

    1603439487336831.png

    对num去重后的数量的统计:SELECT count(t.counts) FROM ( SELECT num,count(*) AS counts from test_a GROUP BY num ) AS t;

    SELECT count(DISTINCT num) AS count FROM test_a;

    它俩结果一样,都是5;只是一个是子查询(嵌套),一个是内置函数 distinct();

    数据库结构

    1603439495179506.png更多相关免费学习推荐:mysql教程(视频)

    展开全文
  • HTML5 统计条数

    2015-09-02 10:19:25
    var db = openDatabase('mydb14', '1.0', 'Test DB', 6 * 1024 * 1024); db.transaction(function (tx) { ... tx.executeSql('select count(*) as tablecount from CenterReimburs ', [], function (tx, results) {
    var db = openDatabase('mydb14', '1.0', 'Test DB', 6 * 1024 * 1024);  
    db.transaction(function (tx) {
    
    	tx.executeSql('select count(*) as tablecount from CenterReimburs ', [], function (tx, results) {
    		var len = results.rows.item(0);
    		console.log(len.tablecount);
    	}, null);
    });


    展开全文
  • MySQL分组后,统计记录条数的方法:1、统计记录条数,代码为【SELECT num,count(*) AS counts from test_a GROUP BY num】;2、对num去重后的数量的统计。MySQL分组后,统计记录条数的方法:分组后,统计记录条数:...
  • mysql 分组后,统计记录条数

    千次阅读 2018-08-23 09:47:24
    MySQL 分组后,统计记录条数 分组后,统计记录条数:  SELECT num,count(*) AS counts from test_a GROUP BY num;   查询结果如下:     对num去重后的数量的统计:  SELECT count(t.counts) FROM ( ...
  • Mysql 分组之后如何统计记录条数并且去重复? gourp by 之后的 count,把group by查询结果当成一个表再count一次: select count(*) as count from (SELECT count(*) FROM 表名 WHERE 条件 GROUP BY id ) a;  .....
  • 分组后,统计记录条数:  SELECT num,count(*) AS counts from test_a GROUP BY num;  查询结果如下:   对num去重后的数量的统计:  SELECT count(t.counts) FROM ( SELECT num,count(*) AS counts ...
  • // 省份查询 $province = M('hospital') -> field('area as label,count(*) as value') -> group('area') -> select(); 输出结果如下所示: array(31) { [0] => array(2) { ["l...
  • select x.*,s.constraint_name ...(select segment_name, sum(s.bytes/1024/1024) as kj,T.NUM_ROWS,w.comments from user_segments s,user_tables t, user_tab_comments w where segment_type = 'TABLE' AND ...
  • sql按照多个字段分组统计记录条数

    千次阅读 2020-06-05 15:32:18
    例如:统计每个人的记录条数,实际上是按照年级,班级,个人统计记录条数,无关分数和分数类型字段 sql如下: SELECT personid , classnum , gradenum , count ( *) AS num FROM ZZZ_SCORE GROUP BY personid, class...
  • --按日统计 SELECT CONVERT(VARCHAR(10),日期列,120) AS days,COUNT(1) AS totalCount FROM 表 GROUP BY CONVERT(VARCHAR(10),日期列,120) ORDER BY days --按周统计 select datepart(week, 日期列) AS weekCount, ...
  • thinkphp 按指定字段统计数据条数

    千次阅读 2018-06-21 19:26:12
    field('id , count(weekday) as num')->where($where)->group('weekday')->select();结果Array( [0] => Array ( [id] => 1 [num] => 3 ) [1] => Array ...
  • SQL一语句统计记录总数及各状态方法一、代码如下:SELECT SUM(正确)+SUM(错误) AS 总记录,SUM(正确),SUM(错误)FROM (SELECT COUNT(1) 正确,0 错误FROM TBWHERE STATUS=1UNION ALLSELECT 0 正确,...
  • 网上使用union all 查询记录总条数的参考资料比较少,所以记录下来,以便有同样需求的人使用。 $rs_num = Db::query("select sum(a.b) as num from ( select count(1) as b from table1 where afrom = '"....
  • mysql查询分组后统计记录条数

    千次阅读 2013-04-25 16:19:56
    select count(*) from (select document_customerNo,document_date from document group by document_customerNo,document_date) as d 后面的as d 必须有,d是随便起的名字
  • 代码如下:SELECT SUM(正确)+SUM(错误) AS 总记录,SUM(正确),SUM(错误) FROM ( SELECT COUNT(1) 正确,0 错误 FROM TB WHERE STATUS=1 UNION ALL SELECT 0 正确,COUNT(1) 错误 FROM TB WHERE ...
  • 统计2个表记录条数

    2014-06-30 22:09:15
    方法一:分别d select count(*) from (select * from [201405] union select * from [201406])as temp
  • SQL一语句统计记录总数及各状态 方法一、 SELECT SUM(正确)+SUM(错误) AS 总记录,SUM(正确),SUM(错误) FROM ( SELECT COUNT(1) 正确,0 错误 FROM TB WHERE STATUS=1 UNION ...
  • sql统计按月统计出新增用户

    千次阅读 2017-12-27 16:11:00
    select date_format(created_at,'%Y-%m') as created_at,count(id) as num from users group by date_format(created_at,'%Y-%m') order by date_format(created_at,'%Y-%m') 改进后 select date_format(created_at...
  • SELECT SUM(rows) as '总记录条数' FROM sys.partitions 转载于:https://www.cnblogs.com/QiuJL/archive/2013/04/27/4524205.html
  • select FROM_UNIXTIME(start_time,'%Y-%m-%d')as date,COUNT(*) FROM random_num GROUP BY FROM_UNIXTIME...sql解释:在 random_num 表中将 start_time 按照 Y-m-d 的格式 进行分组,统计每天的数据条数 转载于...

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