我的查询结果中有多行:
例如,表“附加”:
id_extras - id_order - id_size - name_extra - price
1 1 3 Teddy 4
2 2 8 Balloon 8
3 2 9 Wine 2
4 2 1 Choco 9
5 6 1 Bag 4
我真正想要的是:
id_extras - id_order - id_size - name_extra - price - name_extra1 - name_extra2 - price1 - price2
1 1 3 Teddy 4
2 2 8 Balloon 8 Wine Choco 2 9
3 6 1 Bag 4
所以我需要name_extra
andprice
位于列而不是行中,我现在已经完成了。
SELECT * ,
MAX(CASE WHEN id_order = id_order THEN name_extra ELSE NULL END) name_extra1,
MAX(CASE WHEN id_order = id_order THEN name_extra ELSE NULL END) name_extra2,
MAX(CASE WHEN id_order = id_order THEN price ELSE NULL END) price1,
MAX(CASE WHEN id_order = id_order THEN price ELSE NULL END) price2
FROM extras
GROUP BY id_order