Three tables join in SQL

问题

I am newbie in SQL. I want to join three tables in SQL. Below is my query, please check and correct me where I am wrong -

Tables:

• CARD: ID,Code,Name,CC
• PGM: ID,Code
• PGMeCode: ID,Code,CC

Query:

Select *
FROM CARD
INNER JOIN PGMeCode PGMeCode.Code = CARD.Code AND PGMeCode.CC = CARD.CC
INNER JOIN PGM PGM.Code = Card.Code
WHERE Card.ID = 'SomeThing'

I don't know what I am doing wrong. Please suggest me!!

Thanks in advance.

回答1:

You are missing the keyword ON, placed after the table name.

INNER JOIN tablename ON condition...

回答2:

SELECT * FROM CARD INNER JOIN PGMeCode ON PGMeCode.Code = CARD.Code AND PGMeCode.CC = CARD.CC INNER JOIN PGM ON PGM.Code = Card.Code WHERE Card.ID = 'SomeThing';

Try this query

来源：https://stackoverflow.com/questions/7564863/three-tables-join-in-sql