假设我有下表：
1) tblScore
============================
Date VendorID Score
============================
12/09/01 12001 A
12/09/01 12001 A
12/09/01 12002 B
12/09/02 12003 C
12/09/02 12003 A
12/09/03 12001 C
============================
我有这样的疑问：
SELECT ts.VendorID, ts.Score, COUNT(*)
FROM trxscore ts
GROUP BY ts.VendorID, ts.Score
ORDER BY ts.VendorID, ts.Score
但如何显示表格：
===========================
VendorID A B C
===========================
12001 2 0 1
12002 0 1 0
12003 1 0 1
===========================
并且，是否有可能从文本中获得平均值？ IE。，VendorID 12001应该得到A的平均值。谢谢...
尝试这个，
SELECT VendorID,
SUM(CASE WHEN Score = 'A' THEN 1 ELSE 0 END) totalA,
SUM(CASE WHEN Score = 'B' THEN 1 ELSE 0 END) totalB,
SUM(CASE WHEN Score = 'C' THEN 1 ELSE 0 END) totalC
FROM tableName
GROUP BY VendorID
SQLFiddle 演示 http://sqlfiddle.com/#!2/1de17/2
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