SQL從兩個表中選擇

Question

我有以下數據結構：

TABLE requirements
ID 1, AGE 1, GENDER 1, USERID 1
ID 2, AGE 1, GENDER 2, USERID 2
ID 3, AGE 1, GENDER 2, USERID 3


TABLE offers
IDoffers 1, AGE 1, GENDER 2, USERID 1
IDoffers 2, AGE 1, GENDER 1, USERID 2
IDoffers 3, AGE 1, GENDER 1, USERID 3

我需要選擇表要求的行-用於從表提供的數據中選擇該行的參數。 在循環中。

SELECT * FROM在哪里提供（需求中的ID1 ... IDX）

我需要這個結果：

FOR ID 1 FROM TABLE requirements - RESULT FROM offers:
IDoffers 2, AGE 1, GENDER 1, USERID 2
IDoffers 3, AGE 1, GENDER 1, USERID 3

FOR ID 2 FROM TABLE requirements - RESULT FROM offers:
IDoffers 1, AGE 1, GENDER 2, USERID 1

FOR ID 3 FROM TABLE requirements - RESULT FROM offers:
IDoffers 1, AGE 1, GENDER 2, USERID 1

Answer 1

SELECT
  rquirements.ID,
  offers.*
FROM
  requirements
  INNER JOIN offers ON requirements.AGE=offers.AGE
     AND requirements.GENDER=offers.GENDER

遍歷所有需求。 如果您有特殊要求，請添加

WHERE rquirements.ID=<whatever>