MySQL 5 left join unknown column?
You can only refer the tables previously joined with the JOIN clause in the ON clause SELECT * FROM email e JOIN event_email ee ON ee. Email_id = e. Email_id LEFT JOIN member m ON m.
Email = e. Email This can be illustrated better if I put the quotes around the ANSI JOINS in your original query: SELECT * FROM email e, ( event_email ee LEFT JOIN member m ON m. Email = e.
Email ) WHERE ee. Email_id = e. Email_id As you can see, there is no source for e.
Email inside the quotes: that's why it could not be resolved.
You can only refer the tables previously joined with the JOIN clause in the ON clause. SELECT * FROM email e JOIN event_email ee ON ee. Email_id = e.
Email_id LEFT JOIN member m ON m. Email = e. Email This can be illustrated better if I put the quotes around the ANSI JOINS in your original query: SELECT * FROM email e, ( event_email ee LEFT JOIN member m ON m.
Email = e. Email ) WHERE ee. Email_id = e.
Email_id As you can see, there is no source for e. Email inside the quotes: that's why it could not be resolved.
In the first query, I don't understand your explanation. Which on clause are you referring to? Can you re-phrase?
Thanks – NP. May 12 '10 at 16:37.
The problem is the changed order MySQL uses to join the tables. Maybe take a look at the following page, I've explained the problem there in more detail: mysqljoin.com/joins/joins-in-mysql-5-105....
And all join operations were grouped to the left. Inner join operations. (see Section 8.3.1.9, “Nested Join Optimization”).
MySQL more compliant with standard SQL. Described later in this section. Makes use of indexes.
You can only refer the tables previously joined with the JOIN clause in the ON clause.
The problem is the changed order MySQL uses to join the tables. Maybe take a look at the following page, I've explained the problem there in more detail.
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