MYSQL错误1060 - 重复列

Question

如何避免错误1060？

CREATE VIEW `new-query` AS

SELECT L1.Inv_Num, L1.Line_Num, P1.Prod_SKU, P1.Prod_Descript,
L2.Line_Num, P2.Prod_SKU, P2.Prod_Descript, P1.Brand_ID

FROM LGLINE L1, LGLINE L2, LGPRODUCT P1, LGPRODUCT P2

WHERE P1.Prod_Category IN ('SEALER') AND P2.Prod_Category IN ('TOP COAT');

Answer 1

您指定了两次相同的列名，因此您需要将列名称别名为唯一名称。我刚刚将l1_，l2_ p1_和p2_添加到出现不止一次的列中。

CREATE VIEW new-query AS
SELECT L1.Inv_Num, L1.Line_Num l1_line num, P1.Prod_SKU p1_prod_sku, P1.Prod_Descript p1_prod_descript, L2.Line_Num l2_line num, P2.Prod_SKU p2_prod_sku, P2.Prod_Descript p2_prod_descript, P1.Brand_ID
FROM LGLINE L1, LGLINE L2, LGPRODUCT P1, LGPRODUCT P2
WHERE P1.Prod_Category IN ('SEALER') AND P2.Prod_Category IN ('TOP COAT');