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你好MySQL，再见MySQL
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| SELECT 'normal' = 0 #=> 1 | |
| SELECT 'disable' = 0 #=> 1 | |
| SELECT 'disable1' = 0 #=> 1 | |
| SELECT '1disable' = 0 #=> 0 | |
| SELECT '123456' = 0 #=> 0 |
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SELECT '1' + 1 # => 2
Apparently string is converted to number even if it's on the left side.
If both arguments in a comparison operation are strings, they are compared as strings...In all other cases, the arguments are compared as floating-point (real) numbers.