乘法和除法运算符（表 3 中列出的前四个）具有高于加法和减法的优先级。
The multiplication and division operators (the first four listed in Table 3) have higher precedence than the addition and subtraction operators.
而关系数据库标准查询语言SQL没有除法运算符，不能直接作除法。
However, there are no division symbol in SQL, so the division can not be operated directly.
允许使用除法和乘法、多个函数、账户和运算符。
Allowing division and multiplication, multiple functions, accounts and operators.
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