表达式优先级-SQL语言基础

【文件属性】：
文件名称：表达式优先级-SQL语言基础
文件大小：5.26MB
文件格式：PPT
更新时间：2021-04-25 19:38:06
SQL 基础 表达式优先级 * 乘和除操作的优先级高于加和减； 相同优先级的操作符自左向右进行计算； 圆括号“（”“）”，用来重新组合表达式的优先级。 * / + _ * Operator Precedence If an arithmetic expression contains more than one operator, multiplication and division are evaluated first. If operators within an expression are of same priority, then evaluation is done from left to right. You can use parentheses to force the expression within parentheses to be evaluated first.