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文件名称：使用串接操作符-SQL语言基础
文件大小：5.26MB
文件格式：PPT
更新时间：2021-04-25 19:38:07
SQL 基础
使用串接操作符
*
SQL> SELECT ename||job AS "Employees"
2 FROM emp;
Employees
-------------------
KINGPRESIDENT
BLAKEMANAGER
CLARKMANAGER
JONESMANAGER
MARTINSALESMAN
ALLENSALESMAN
...
14 rows selected.
*
SELECT ename||job AS "Employees"
FROM emp;
Concatenation Operator (continued)
In the example, ENAME and JOB are concatenated, and they are given the alias Employees. Notice that the employee number and job are combined to make a single output column.
The AS keyword before the alias name makes the SELECT clause easier to read.