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文件名称：在SQL语句中运用数学表达式-SQL语言基础
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更新时间：2021-04-25 19:38:06
SQL 基础
在SQL语句中运用数学表达式
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SQL> SELECT ename, sal, sal+300
2 FROM emp;
ENAME SAL SAL+300
---------- --------- ---------
KING 5000 5300
BLAKE 2850 3150
CLARK 2450 2750
JONES 2975 3275
MARTIN 1250 1550
ALLEN 1600 1900
...
14 rows selected.
*
Using Arithmetic Operators
The example in the slide uses the addition operator to calculate a salary increase of $300 for all employees and displays a new SAL+300 column in the output.
Note that the resultant calculated column SAL+300 is not a new column in the EMP table; it is for display only. By default, the name of a new column comes from the calculation that generated it—in this case, sal+300.
Note: SQL*Plus ignores blank spaces before and after the arithmetic operator.