显示结果来自SQL中的一列

Question

我有一个表存储Row Id和Col Id用于不同的项目名称和相关数量....这描述如下....

RowId   ColID   Value
3         2     Laptop
4         2     Mouse
4         4      80
3         4      50

我需要输出：

Value   Qty
Laptop  50
Mouse   80

Answer 1

SELECT a.value AS Value, b.value AS Qty
FROM 
(SELECT RowId, VALUE FROM test WHERE COLID = 2 ORDER BY ROWID) a,
(SELECT RowId, VALUE FROM test WHERE COLID = 4 ORDER BY ROWID) b
WHERE a.rowid = b.rowid