物品表：
| Item | Qnty | ProdSched | | a | 1 | 1 | | b | 2 | 1 | | c | 3 | 1 | | a | 4 | 2 | | b | 5 | 2 | | c | 6 | 2 |
| Item | ProdSched(1)(Qnty) | ProdSched(2)(Qnty) | | a | 1 | 4 | | b | 2 | 5 | | c | 3 | 6 |
解决方法
SELECT Item,[ProdSched(1)(Qnty)] = MAX(CASE WHEN ProdSched = 1 THEN Qnty END),[ProdSched(2)(Qnty)] = MAX(CASE WHEN ProdSched = 2 THEN Qnty END) FROM dbo.tablename GROUP BY Item ORDER BY Item;
