为什么在MySQL中使用CAST时会出现语法错误？

Question

I am using MySQL workbench v5.2.44 CE. I am running it against a local MySQL 5.5 install.

I am trying to use the CAST function, but keep getting the following error:

syntax error, unexpected INT_SYM

It doesn't matter what the source and target date types are. The only time it doesn't give me an error is when the target datatype is DECIMAL . Here is an example:

SELECT CAST(IFNULL(comboCount, 1) * COUNT(partID) AS INT) INTO comboCount
FROM productOption

I have tried everything, but nothing seems to work.

Answer 1

Try to do the math outside:

SELECT CAST(IFNULL(comboCount, 1) AS INT) * COUNT(partID) INTO comboCount
FROM productOption

If that doesn't work, try to CAST as UNSIGNED ; not INT .