【文件属性】：
文件名称：函数的嵌套-SQL语言基础
文件大小：5.26MB
文件格式：PPT
更新时间：2021-04-25 19:38:15
SQL 基础
函数的嵌套
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F3(F2(F1(col,arg1),arg2),arg3)
Step 1 = Result 1
Step 2 = Result 2
Step 3 = Result 3
单行的函数可以嵌套到任何一个层次.
嵌套函数的计算顺序——先计算深层嵌套，再计算浅层嵌套.
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Nesting Functions
Single-row functions can be nested to any depth. Nested functions are evaluated from the innermost level to the outermost level. Some examples follow to show you the flexibility of these functions.