Arithmetic Operators
+，－，×，÷
Comparison Operators
＝，<>，!=，>，<，>=，<=
BETWEEN，IN，IS NULL
Logical Operators
AND，OR，NOT[LIKE | IN | BETWEEN | NULL]
String Operators
LIKE，||
Operators precendence
parentheses > comparison > AND > OR
() > 比较 > and > or
Arithmetic > Comparison > Logical
Strings comparison
digits < lowercase letters < uppercase letters.