SQL統(tǒng)計數(shù)量？設:取每個id的統(tǒng)計數(shù)量 取行數(shù): select Count(*) from 表 group by id 取總數(shù): select sum(A) from 表 group by id 取

SQL統(tǒng)計數(shù)量？

設:取每個id的統(tǒng)計數(shù)量 取行數(shù): select Count(*) from 表 group by id 取總數(shù): select sum(A) from 表 group by id 取最大值: select max(A) from 表 group by id 取最小值: select min(A) from 表 group by id 取平均值: select avg(A) from 表 group by id 如果不是去每個id的統(tǒng)計數(shù)據(jù)，而是取所有記錄，去掉group by id

sql如何統(tǒng)計一個表里各個數(shù)字的出現(xiàn)次數(shù)？

select countB)from A group by B order by BSQL語句就可以做了，例檢索表格aaa，添加一列“re_num”，顯示a列值重復的次數(shù)，aaa a1 join (select a，count(a) as "re_num" from aaa group by a) a2 on a1.a = a2.aselect sum(datac.COUNT_VALUE)from T_JL_COUNT_DATA datac， T_JL_XC_RESULT awhere datac.COUNT_NO=45 and a.id=datac.RESULT_ID。

Sql統(tǒng)計數(shù)量？

方法一：SELECTSUM(正確數(shù)) SUM(錯誤數(shù))AS總記錄數(shù)，SUM(正確數(shù))，SUM(錯誤數(shù)) FROM( SELECTCOUNT(1)正確數(shù)，0錯誤數(shù) FROMTB WHERESTATUS=1 UNIONALL SELECT0正確數(shù)，COUNT(1)錯誤數(shù) FROMTB WHERESTATUS=0)a方法二：selectcount(1)總記錄數(shù)，sum(casewhenstatus=1then1else0end)正確數(shù)，sum(casewhenstatus=0then1else0end)錯誤數(shù)fromT