Mysql count case when 多个条件
WebJul 22, 2024 · You should count 1 for a match, and count NULL when there is no match:. SELECT account_id, COUNT(CASE WHEN action_type = 1 AND action_name = 'like' THEN 1 END) AS `like`, COUNT(CASE WHEN action_type = 1 AND action_name = 'superLike' THEN 1 END) AS superLike, COUNT(CASE WHEN action_type = 2 THEN 1 END) AS follow FROM … Web这两种方式，可以实现相同的功能。. 简单Case函数的写法相对比较简洁，但是和Case搜索函数相比，功能方面会有些限制，比如写判断式。. 还有一个需要注意的问题，Case函数只返回第一个符合条件的值，剩下的Case部分将会被自动忽略。. --比如说，下面这段SQL ...
Mysql count case when 多个条件
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WebJul 29, 2024 · cid cname inv_count l_inv_date s_tot refund valid_billed 1 cust1 3 2024-01-05 3 0 3 2 cust2 3 2024-02-05 6 0 6 3 cust3 3 2024-03-14 9.8 0 9.8 4 cust4 5 2024-04-21 212.6 12.3 200.3 5 cust5 0 NULL 0 0 0 WebThe MySQL COUNT () function provides a number of records in the result set from a table when an SQL SELECT statement is executed. This function does not count the NULL values. The count function gives a BIGINT value. This aggregate function returns all rows or only rows which are matched to specified conditions and if there is no row that ...
WebDec 14, 2016 · Add a comment. 0. SELECT CASE WHEN X THEN Y ELSE Z END *NEW COLUMN NAME* , COUNT (*) FROM TABLE GROUP BY *NEW COLUMN NAME*. This should return two columns, one with the buckets/case statement and one with the count of the columns for each one of your buckets. This method was the most straightforward for … WebDec 30, 2024 · Perform count with CASE WHEN statement in MySQL? MySQL MySQLi Database. For this, you can use CASE WHEN statement. Let us first create a table −. …
WebSep 15, 2024 · case与end之间可以有多个when…then…else语句。 END表示CASE语句结束。 场景 ：score 大于等于90为优秀，80-90为良好，60-80为及格，小于60为不及格，用SQL … Webcase when 的语法有如下两种：. 1 CASE WHEN [expr] THEN [result1]…. ELSE [default] END 2 CASE [col_name] WHEN [value1/expr1] THEN [result1]…. ELSE [default] END. 注意：. 第一 …
WebJul 5, 2024 · mysql having多个条件. 青山淼淼. 关注. IP属地: 四川. 0.12 2024.07.05 18:40:27 字数 48 阅读 11,981. SELECT COUNT( * ) AS c, target_id FROM expend WHERE expense_type = 1 AND target_id IN ( SELECT id FROM user WHERE add_time >= UNIX_TIMESTAMP( "2024-06-29" ) AND add_time < UNIX_TIMESTAMP( "2024-06-30" ) AND user_id > 0 ) AND TIME ...
WebDec 4, 2024 · 条件统计. count () 函数中使用条件表达式加 or null 来实现，作用就是当条件不满足时，函数变成了 count (null) 不会统计数量. count () 函数中使用 if 表达式来实现，当条件满足是表达式的值为非空，条件不满足时表达式值为 NULL; count () 函数中使用 case when … taxi mai linh gia laiWebMay 6, 2016 · count ( case province when '浙江省' then '浙江省' end )as 浙江省. from student group by sex. count ()函数即根据给定的范围和group by (统计方式) 而统计行数据的条数. 我们一步步来理解上面语句. 1. select sex from student (查询数据表中的存在的男女条数) 2.select sex, count (*) as num from ... taxi mait hainburgWebcount (expr)函数的参数 expr可以是任意的表达式，该函数用于统计在符合搜索条件的记录总数；. count (expr)函数执行效率从低到高排序为： count (非主键字段) < count (主键) < count (1) ≈ count (*) ；. 对于 count (1) 和 count (*) ，效率相当，建议尽量使用 count (*)，因为 … taxi makedoniaWebNov 11, 2024 · Use CASE WHEN for this in MySQL and set CASE condition inside the COUNT() method to count. Let us first create a table −. mysql> create table DemoTable1374 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> Score int -> ); Query OK, 0 rows affected (0.61 sec) taxi mai linh ba ria vung tautaxi mai linh airportWebcase与end之间可以有多个when…then…else语句。 END表示CASE语句结束。 场景 ：score 大于等于90为优秀，80-90为良好，60-80为及格，小于60为不及格，用SQL语句统计出 … taxi majadahonda aeropuertoWebOct 4, 2013 · Below is the Approach : select sum (lcd) lcdcnt, sum (led) ledcnt, sum (3d) 3dcnt, sum (hd) hdnt, sum (fullhd) fullhdcnt, sum (3d) 3dcnt, sum (case when displaysize between 1 and 32 then 1 else 0 end) as dispcntlessthan32, sum (case when displaysize between 33 and 42 then 1 else 0 end) as displaycntbetween32and42 from table1 where … taxi mai linh an giang