如果我有一个带有主键“ID”的表,然后我在列中有其他数据(例如:姓名、地址、电话号码),我如何进行查询以显示姓名、地址和特定ID的PhoneNum(整行)垂直?
如果需要,我可以发布一张图片来解释我的意思。
谢谢!:)
对于名为 [Clients] 的表中的示例数据
ID LastName FirstName Email
-- -------- --------- -----
1 Thompson Gord gord@example.com
2 Loblaw Bob bob@example.com
3 Kingsley Hank hank@example.com
查询
SELECT "LastName" AS fld, LastName AS val FROM Clients WHERE ID=1
UNION ALL
SELECT "FirstName" AS fld, FirstName AS val FROM Clients WHERE ID=1
UNION ALL
SELECT "Email" AS fld, Email AS val FROM Clients WHERE ID=1;
返回
fld val
--- ---
LastName Thompson
FirstName Gord
Email gord@example.com