question

In MySQL, certain words such as SELECT, INSERT, DELETE, etc. are reserved words. Because they have a special meaning, MySQL treats it as a syntax error whenever you use them as table names, column names, or other types of identifiers - unless you enclose the identifier in backticks.

As stated in the official documentation, in 10.2 Schema Object Name em> (emphasis added):

A complete list of keywords and reserved words can be found in the 10.3 Keywords section and Reserved Words . In this page, words followed by "(R)" are reserved words. Some reserved words are listed below, including many that tend to cause this problem.

• Add to
• and
• Before
• author
• Call
• CASE
• condition
• delete
• Descending order
• describe
• from
• group
• exist
• index
• insert
• interval
• yes
• The essential
• LIKE
• limit
• LONG
• match
• No
• Options
• or
• order
• Partition
• Ranking
• references
• choose
• TABLE
• To
• renew
• where

solution

You have two options.

1. Do not use reserved words as identifiers

The simplest solution is to avoid using reserved words as identifiers. You may be able to find another reasonable name for your column that is not a reserved word.

This has several advantages:

• It eliminates the possibility that you or other developers working with the database will accidentally write syntax errors because they forgot or did not know that a specific identifier was a reserved word. There are many reserved words in MySQL, and it is unlikely that most developers know all of them. By not using these words in the first place, you avoid creating traps for yourself or future developers.

• The way identifiers are quoted differs between SQL dialects. While MySQL uses backticks to quote identifiers by default, ANSI-compliant SQL (actually MySQL in ANSI SQL mode, as described here) uses double quotes to quote identifiers. Therefore, queries that use backticks to quote identifiers are less portable to other SQL dialects.

Purely to reduce the risk of future errors, this is generally a smarter approach than backticking identifiers.

2. Use backtick

If the table or column cannot be renamed, enclose the identifier in question in backticks (

`

), as quoted earlier 10.2 Schema Object Names . Example demonstrating usage (taken from

10.3 Keywords and Reserved Words

):

Again, the query in the question can be fixed by enclosing the key key

in backticks, like this:

INSERT INTO user_details (username, location, `key`)
VALUES ('Tim', 'Florida', 42)";               ^   ^