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There are three types of mysql comments, namely: 1. Single-line comments using "#comment content"; 2. Single-line comments using "-- comment content", "--" and comment content There must be spaces between; 3. Use "/* comment content*/" for multi-line comments.
MySQL generally has three comment styles. They are:
1. Single-line comments can use "# "
select 1 as cname; #this is a comment +-------+ | cname | +-------+ | 1 | +-------+ -- (#后面直接根的就是注释)
2. The second way to write a single-line comment is to use "-- "
Note that in this style "--[space]" is There is a space between "--" and the comment.
select 123; -- this is a comment +-----+ | 123 | +-----+ | 123 | +-----+ -- 注意啊-- 后面是要有一个空格的
3. Multi-line comments can be made with /**/
mysql> select 123; /* this is a comment */+-----+ | 123 | +-----+ | 123 | +-----+1 row in set (0.00 sec) mysql> select 1+ /* this is a comment */ 1;+-------+ | 1+ 1 | +-------+ | 2 | +-------+1 row in set (0.00 sec)
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