<>在SQL上意味着什么

Question

I was looking for what the <> mean on sql syntax but it was hard to google for it since google removes my special characters.

Specifically I was trying to figure out what the following means:

... AND (s1.skips > 0 OR s1.fails <> 1 OR s2.skips > 0);

Is there any clear documentation talking about the <> clause?

Answer 1

Please have a look at the documentation.

Comparison Functions and Operators

Answer 2

当然，它是“不等于” - 操作符，与！=相同，请参见手册

Answer 3

<> is the equivalent of != in many other programming languages.

Specifically, your MySQL query makes the following restrictions if any of these are true:

• s1.skips > 0 - Number of s1 skips is greater than 0
• s1.fails <> 1 - Number of s1 fails is NOT 1
• s2.skips > 0 - Number of s2 skips is greater than 0