sql SELECT sales_region, SUM(CASE WHEN sales_amount < 500 THEN sales_amount ELSE 0 END) AS sum_below_500, SUM(CASE WHEN sales_amount >= 500 AND sales_amount <= 1000 THEN sales_amount ELSE 0 END) AS sum_500_to_1000, SUM(CASE WHEN sales_amount > 1000 THEN sales_am...
( case u.sexwhen 1 then '男'when 2 then '女'else '空的'END) 性别from users u; (3)将sum与case结合使用,可以实现分段统计。 例如现在我希望将上表中各种性别的人数进行统计,sql语句如下 selectsum( case u.sex when 1 then 1 else 0 end) 男性,sum( case u.sex when 2 then 1 else 0 ...
declare @sql varchar(8000) set @sql = 'select name ' select @sql = @sql + ' , sum(case Subject when '+ char(39) + Subject + char(39) +' then Result else 0 end) [' + Subject + ']' from (select distinct Subject from results) as a set @sql = @sql + ' from results grou...
from users u; (3)将sum与case结合使用,可以实现分段统计。 例如现在我希望将上表中各种性别的人数进行统计,sql语句如下 select sum( case u.sex when 1 then 1 else 0 end) 男性, sum( case u.sex when 2 then 1 else 0 end) 女性, sum( case when u.sex<>1 and u.sex<>2 then 1 else 0 ...
select sum(case when a.XX = '北京' then '1' else null end)from table a;补充'1' 这里可以是 1 或者'1'，但要求必须是数字才可以 。 否则就是无效的数字
// 如果 f_this_price = 0 或 f_last_price = 0 则结果为 0 ,如果都不为 0 时, 取两列差的合计 SELECT f_wzbm, CASE WHEN SUM(f_this_price) = 0 OR SUM(f_last_price) = 0 THEN 0 ELSE SUM(f_this_price - f_last_price) END f_markup_price FROM table_name GROUP BY f_wzbm;...
遇到需要整合的sql是使用CASE WHEN还是UNION呢? SELECT COUNT(*) FROM t WHERE (TO_CHAR( SYSDATE, 'YYYY' ) - SUBSTR( INPUT_IDCARD, 7, 4 ) ) BETWEEN 20 AND 30 UNION ALL SELECT COUNT(*) FROM t WHERE (TO_CHAR( SYSDATE, 'YYYY' ) - SUBSTR( INPUT_IDCARD, 7, 4 ) ) BETWEEN 31 AND...
sum(case whento_char(subscribe_time,'dd')='01' thensubscribe_numelse 0 end), sum(case whento_char(subscribe_time,'dd')='02' thensubscribe_numelse 0 end), sum(case whento_char(subscribe_time,'dd')='03' thensubscribe_numelse 0 end), sum(case whento_char(subscribe_time,'dd')='...
1.SUM（列名）是SQL内置函数，用于求这一列数据的和，如果跟GROUP BY 要注意是求这一组记录的这一列数据之和。2.case when…then…else…end 这是PL/SQL语句，意思是遇到什么情况，就怎么怎么做，没有遇到的话，就按else后面的做，最后end结束。3.sum(case when s_id=1 then p_num else 0 ...
普通情况下,用UNION也可以实现用一条语句进行查询。但是那样增加消耗(两个Select部分),而且SQL语句会比较长。 下面是一个是用Case函数来完成这个功能的例子 SELECT country, SUM(CASEWHENsex ='1'THEN populationELSE 0END),--男性人口 SUM(CASEWHENsex ='2'THEN populationELSE 0END)--女性人口 ...