SELECT COUNT中的SELECT COUNT

Question

我正在尝试此代码。

SELECT COUNT(SELECT COUNT(postnID) AS Total,
 postnID, Unit_DBM, job_type, 
 level, internal_plantilla, INCID,
 ITEM_NO_2005, position_type, 
 position_status 
 FROM plantilla 
 GROUP BY internal_plantilla, level, INCID, postnID, position_status       
 ORDER BY internal_plantilla, postnID) as num 
 FROM plantilla

但是在mysql中有错误。如何在选择计数内执行选择计数？

Answer 1

你可以做：

SELECT COUNT(*) from (SELECT COUNT(postnID) AS Total,
 postnID, Unit_DBM, job_type, 
 level, internal_plantilla, INCID,
 ITEM_NO_2005, position_type, 
 position_status 
 FROM plantilla 
 GROUP BY internal_plantilla, level, INCID, postnID, position_status       
 ORDER BY internal_plantilla, postnID) as num