CODEWITHSUNDEEP
mysql
Fauxcuss
Fauxcuss

Reputation: 468

Why did this query which worked in MySQL4 not work in MySQL5?

Recently upgraded a database from MySQL 4 to MySQL 5. The following query is now broken:

SELECT COUNT(*) FROM Customer, Product INNER JOIN Orders 
ON (Customer.Email = Orders.Email)
WHERE NOT (Product.Flags & 8) AND 
    Customer.CustomerNumber = Product.CustomerNumber AND
    Truncate(Orders.ProductId/10, 0) = Truncate(Product.ProductId/10, 0)

Getting the following error:

#1054 - Unknown column 'Customer.Email' in 'on clause'

I didn't write this query, and I am not a SQL guru, but I'm am guessing is may be a mix of ANSI-89/ANSI-92 style joins and there may be some kind of precedence issue going on.

Can you explain the error, describing what's wrong with this query, and how to correctly specify the joins?

Upvotes: 1

Views: 255

Answers (1)

eggyal
eggyal

Reputation: 125865

As documented under JOIN Syntax:

 Join Processing Changes in MySQL 5.0.12

[ deletia ]

The following list provides more detail about several effects of current join processing versus join processing in older versions. The term “previously” means “prior to MySQL 5.0.12.”

[ deletia ]

  • Previously, the comma operator (,) and JOIN both had the same precedence, so the join expression t1, t2 JOIN t3 was interpreted as ((t1, t2) JOIN t3). Now JOIN has higher precedence, so the expression is interpreted as (t1, (t2 JOIN t3)). This change affects statements that use an ON clause, because that clause can refer only to columns in the operands of the join, and the change in precedence changes interpretation of what those operands are.

    Example:

    CREATE TABLE t1 (i1 INT, j1 INT);
CREATE TABLE t2 (i2 INT, j2 INT);
CREATE TABLE t3 (i3 INT, j3 INT);
INSERT INTO t1 VALUES(1,1);
INSERT INTO t2 VALUES(1,1);
INSERT INTO t3 VALUES(1,1);
SELECT * FROM t1, t2 JOIN t3 ON (t1.i1 = t3.i3);

    Previously, the SELECT was legal due to the implicit grouping of t1,t2 as (t1,t2). Now the JOIN takes precedence, so the operands for the ON clause are t2 and t3. Because t1.i1 is not a column in either of the operands, the result is an Unknown column 't1.i1' in 'on clause' error. To allow the join to be processed, group the first two tables explicitly with parentheses so that the operands for the ON clause are (t1,t2) and t3:

    SELECT * FROM (t1, t2) JOIN t3 ON (t1.i1 = t3.i3);

    Alternatively, avoid the use of the comma operator and use JOIN instead:

    SELECT * FROM t1 JOIN t2 JOIN t3 ON (t1.i1 = t3.i3);

    This change also applies to statements that mix the comma operator with INNER JOIN, CROSS JOIN, LEFT JOIN, and RIGHT JOIN, all of which now have higher precedence than the comma operator.

Upvotes: 6

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