使用MySQL语法,如何编写查询以返回以下内容(我包括两个表描述及它们之间的关系):
TABLE_A (ID, DATE, TABLE_C_ID)
TABLE_B (ID, AMOUNT, TABLE_A_ID)
TABLE_C (ID)
我想返回以下内容,但具有指定的限制:
SELECT
TABLE_A.ID,
TABLE_A.DATE
(SUM TABLE_B.AMOUNT
FROM TABLE_B
WHERE TABLE_B.ID = TABLE_A.ID)
FROM TABLE_A, TABLE_B
WHERE TABLE_A.TABLE_C_ID = 123
提前致谢。
答案 0 :(得分:2)
这样做有什么问题?:
SELECT
TABLE_A.ID,
TABLE_A.DATE,
SUM( TABLE_B.AMOUNT ) AS AMOUNT
FROM TABLE_A
INNER JOIN TABLE_B
ON TABLE_B.ID = TABLE_A.ID
WHERE TABLE_A.TABLE_C_ID = 123
GROUP BY TABLE_A.ID,
TABLE_A.DATE