MySQL Error 1005 & 150: Why Can\'t I Create My Tables?

MySql Error 1005: Can't Create Table - Uncovering the Culprit of Error 150

In an attempt to define two tables, specifically 'foo' and 'bar,' an error message plagues the process, hinting at an elusive "error 150." Let's journey into the realms of MySQL to unveil the hidden cause and unravel the mystery behind this code conundrum.

Upon closer examination, both queries appear devoid of glaring errors. However, the accompanying error message suggests otherwise. Examining the error message carefully, we stumble upon a reference to error 150. Diving into the depths of MySQL documentation, we chance upon the concept of FOREIGN KEY Constraints.

Within the context of FOREIGN KEY Constraints, a curious note catches our attention: "If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it." This revelation prompts us to delve into the circumstances leading to this error. It's crucial that the table being recreated ("foo" in our case) adheres to the column names, data types, and index definitions required by foreign key constraints. Any deviation from these specifications could trigger MySQL to issue error 1005, accompanied by a reference to error 150.

Considering the error message and the insights gleaned from the MySQL documentation, our suspicion falls upon the possibility that 'foo' may not have been created using the InnoDB storage engine. A review of the documentation confirms this suspicion: "Both tables must be InnoDB tables and they must not be TEMPORARY tables."

By ensuring that both 'foo' and 'bar' are indeed InnoDB tables and by avoiding the use of TEMPORARY tables, we can eliminate this potential cause of error. It's worth noting that other factors could also contribute to error 150, but this particular scenario aligns neatly with the information provided.

The above is the detailed content of MySQL Error 1005 & 150: Why Can\'t I Create My Tables?. For more information, please follow other related articles on the PHP Chinese website!