sql語句統(tǒng)計(jì)人數(shù) SQL怎么統(tǒng)計(jì)個數(shù)?
SQL怎么統(tǒng)計(jì)個數(shù)?方法一:SELECT SUM(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 ( SELECT COUNT(1) 正確數(shù),0 錯誤數(shù) FR
SQL怎么統(tǒng)計(jì)個數(shù)?
方法一:
SELECT SUM(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 ( SELECT COUNT(1) 正確數(shù),0 錯誤數(shù) FROM TB WHERE STATUS=1 UNION ALL SELECT 0 正確數(shù),COUNT(1) 錯誤數(shù) FROM TB WHERE STATUS=0) a
方法二:
select count(1)總記錄數(shù),sum(case when status=1 then 1 else 0 end)正確數(shù),sum(case when status=0 then 1 else 0 end) 錯誤數(shù) from T
1、統(tǒng)計(jì)平均數(shù):
SELECT AVG(column) FROM tb_name 該 SQL 語法用于統(tǒng)計(jì)某一數(shù)值類型字段的平均數(shù),AVG() 內(nèi)不能是多個字段,字符串等類型雖然可以執(zhí)行,但無意義。
2、統(tǒng)計(jì)數(shù)據(jù)之和:
SELECT SUM(column) FROM tb_name 該 SQL 語法用于統(tǒng)計(jì)某一數(shù)值類型字段的數(shù)值之和,SUM() 內(nèi)不能是多個字段,字符串等類型雖然可以執(zhí)行,但無意義。
3、統(tǒng)計(jì)最大數(shù)據(jù):
SELECT MAX(column) FROM tb_name 該 SQL 語法用于統(tǒng)計(jì)某一數(shù)值類型字段的數(shù)值最大值,MAX() 內(nèi)不能是多個字段。
4、統(tǒng)計(jì)最小數(shù)據(jù):
SELECT MIN(column) FROM tb_name SQL 語法用于統(tǒng)計(jì)某一數(shù)值類型字段的數(shù)值最小值,MIN() 內(nèi)不能是多個字段。
SQL統(tǒng)計(jì)數(shù)量?
設(shè):取每個id的統(tǒng)計(jì)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(jì)數(shù)據(jù),而是取所有記錄,去掉group by id
sql語句統(tǒng)計(jì)查詢結(jié)果數(shù)量怎么寫?
如何統(tǒng)計(jì)sql語句查詢出來的條數(shù)可以通過count函數(shù)來實(shí)現(xiàn)。sqlOne:select * from tablename1 where id>5此語句查詢出來多條記錄,之后看做一個新的表。sqlTwo:select conut(*) from (select * from tablename1 where id>5) as tablename2此語句即可查詢出來統(tǒng)計(jì)的記錄條數(shù)。備注:以上方法通用于所有的數(shù)據(jù)統(tǒng)計(jì),如果是單表查詢,可以直接通過:“select count( *) from tablename1 where id>5"的形式查詢出結(jié)果。
Sql統(tǒng)計(jì)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