Du kan göra det med hjälp av korrelerade underfrågor så här:
SELECT
Company,
Date,
(SELECT COUNT(*) FROM MyTable AS T1
WHERE T1.Flag='Y' AND T1.Company=T2.Company AND T1.Date=T2.Date) AS Count_Y,
(SELECT COUNT(*) FROM MyTable AS T1
WHERE T1.Flag='N' AND T1.Company=T2.Company AND T1.Date=T2.Date) AS Count_N
FROM MyTable AS T2
GROUP BY Company, Date
Du kan också göra det mer kortfattat, men kanske med (förmodligen) något mindre läsbarhet med SUM
knep:
SELECT
Company,
Date,
SUM(CASE WHEN Flag='Y' THEN 1 ELSE 0 END) AS Count_Y,
SUM(CASE WHEN Flag='N' THEN 1 ELSE 0 END) AS Count_N,
FROM MyTable
GROUP BY Company, Date
I Oracle/PLSQL, DECODE
funktionen kan användas för att ersätta CASE
för det ännu mer kortfattade:
SELECT
Company,
Date,
SUM(DECODE(Flag,'Y',1,0)) AS Count_Y,
SUM(DECODE(Flag,'N',1,0)) AS Count_N,
FROM MyTable
GROUP BY Company, Date