MySQL Syntax error message “Operand should contain 1 column(s)”


I tried running the following statement:

SELECT (a.number, b.ID, b.DENOMINATION) 
FROM temp_cheques a, BOOK b

which, as I understand it, should insert into VOUCHER each record from temp_cheques with the ID and DENOMINATION fields corresponding to entries in the BOOK table (temp_cheques comes from a database backup, which I'm trying to recreate in a different format). However, when I run it, I get an error:

Error: Operand should contain 1 column(s)
SQLState:  21000
ErrorCode: 1241

I'm running this in SQuirrel and have not had issues with any other queries. Is there something wrong with the syntax of my query?


The structure of BOOK is:

ID  int(11)
START_NUMBER    int(11)
UNITS   int(11)
DENOMINATION    double(5,2)

The structure of temp_cheques is:

ID  int(11)
number  varchar(20)

Best Solution

Try removing the parenthesis from the SELECT clause. From Microsoft TechNet, the correct syntax for an INSERT statement using a SELECT clause is the following.

INSERT INTO MyTable  (PriKey, Description)
       SELECT ForeignKey, Description
       FROM SomeView

The error you're getting, "The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay.", is actually correct, assuming you have many rows in both BOOK and temp_cheques. You are trying to query all rows from both tables and make a cross-reference, resulting in an m*n size query. SQL Server is trying to warn you of this, before performing a potentially long operation.

Set SQL_BIG_SELECTS = 1 before running this statement, and try again. It should work, but note that this operation may take a long time.