Oracle基本查询2

xiaoxiao2021-02-28 105

SQL> host cls SQL> --查询员工信息：员工号姓名月薪年薪 SQL> select empno,ename,sal,sal*12 2 from emp; EMPNO ENAME SAL SAL*12 ---------- ---------- ---------- ---------- 7369 SMITH 800 9600 7499 ALLEN 1600 19200 7521 WARD 1250 15000 7566 JONES 2975 35700 7654 MARTIN 1250 15000 7698 BLAKE 2850 34200 7782 CLARK 2450 29400 7788 SCOTT 3000 36000 7839 KING 5000 60000 7844 TURNER 1500 18000 7876 ADAMS 1100 13200 EMPNO ENAME SAL SAL*12 ---------- ---------- ---------- ---------- 7900 JAMES 950 11400 7902 FORD 3000 36000 7934 MILLER 1300 15600 已选择14行。 SQL> --查询员工信息：员工号姓名月薪年薪奖金年收入 SQL> select empno,ename,sal,sal*12,comm,sal*12+comm 2 from emp; EMPNO ENAME SAL SAL*12 COMM SAL*12+COMM ---------- ---------- ---------- ---------- ---------- ----------- 7369 SMITH 800 9600 7499 ALLEN 1600 19200 300 19500 7521 WARD 1250 15000 500 15500 7566 JONES 2975 35700 7654 MARTIN 1250 15000 1400 16400 7698 BLAKE 2850 34200 7782 CLARK 2450 29400 7788 SCOTT 3000 36000 7839 KING 5000 60000 7844 TURNER 1500 18000 0 18000 7876 ADAMS 1100 13200 EMPNO ENAME SAL SAL*12 COMM SAL*12+COMM ---------- ---------- ---------- ---------- ---------- ----------- 7900 JAMES 950 11400 7902 FORD 3000 36000 7934 MILLER 1300 15600 已选择14行。 SQL> /* SQL> sql语句中的null值问题： SQL> 1.包含null的表达式都为空 SQL> */ SQL> /* SQL> Oracle中的滤空函数：nvl(a,b)当a为空的时候，返回b SQL> */ SQL> select empno,ename,sal,sal*12,comm,nvl(sal*12+comm,sal*12) 2 from emp; EMPNO ENAME SAL SAL*12 COMM NVL(SAL*12+COMM,SAL*12) ---------- ---------- ---------- ---------- ---------- ----------------------- 7369 SMITH 800 9600 9600 7499 ALLEN 1600 19200 300 19500 7521 WARD 1250 15000 500 15500 7566 JONES 2975 35700 35700 7654 MARTIN 1250 15000 1400 16400 7698 BLAKE 2850 34200 34200 7782 CLARK 2450 29400 29400 7788 SCOTT 3000 36000 36000 7839 KING 5000 60000 60000 7844 TURNER 1500 18000 0 18000 7876 ADAMS 1100 13200 13200 EMPNO ENAME SAL SAL*12 COMM NVL(SAL*12+COMM,SAL*12) ---------- ---------- ---------- ---------- ---------- ----------------------- 7900 JAMES 950 11400 11400 7902 FORD 3000 36000 36000 7934 MILLER 1300 15600 15600 已选择14行。 SQL> select empno,ename,sal,sal*12,comm,sal*12+nvl(comm,0) 2 from emp; EMPNO ENAME SAL SAL*12 COMM SAL*12+NVL(COMM,0) ---------- ---------- ---------- ---------- ---------- ------------------ 7369 SMITH 800 9600 9600 7499 ALLEN 1600 19200 300 19500 7521 WARD 1250 15000 500 15500 7566 JONES 2975 35700 35700 7654 MARTIN 1250 15000 1400 16400 7698 BLAKE 2850 34200 34200 7782 CLARK 2450 29400 29400 7788 SCOTT 3000 36000 36000 7839 KING 5000 60000 60000 7844 TURNER 1500 18000 0 18000 7876 ADAMS 1100 13200 13200 EMPNO ENAME SAL SAL*12 COMM SAL*12+NVL(COMM,0) ---------- ---------- ---------- ---------- ---------- ------------------ 7900 JAMES 950 11400 11400 7902 FORD 3000 36000 36000 7934 MILLER 1300 15600 15600 已选择14行。 SQL> --查询奖金为null的员工 SQL> select * 2 from 3 SQL> select * 2 from emp 3 where comm=null; 未选定行 SQL> /* SQL> Oracle中判断null不能用“=”或者“！=” SQL> */ SQL> select * 2 from emp 3 where comm is null; EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7369 SMITH CLERK 7902 17-12月-80 800 20 7566 JONES MANAGER 7839 02-4月 -81 2975 20 7698 BLAKE MANAGER 7839 01-5月 -81 2850 30 EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7782 CLARK MANAGER 7839 09-6月 -81 2450 10 7788 SCOTT ANALYST 7566 19-4月 -87 3000 20 7839 KING PRESIDENT 17-11月-81 5000 10 EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7876 ADAMS CLERK 7788 23-5月 -87 1100 20 7900 JAMES CLERK 7698 03-12月-81 950 30 7902 FORD ANALYST 7566 03-12月-81 3000 20 EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7934 MILLER CLERK 7782 23-1月 -82 1300 10 已选择10行。 SQL> / EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7369 SMITH CLERK 7902 17-12月-80 800 20 7566 JONES MANAGER 7839 02-4月 -81 2975 20 7698 BLAKE MANAGER 7839 01-5月 -81 2850 30 EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7782 CLARK MANAGER 7839 09-6月 -81 2450 10 7788 SCOTT ANALYST 7566 19-4月 -87 3000 20 7839 KING PRESIDENT 17-11月-81 5000 10 EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7876 ADAMS CLERK 7788 23-5月 -87 1100 20 7900 JAMES CLERK 7698 03-12月-81 950 30 7902 FORD ANALYST 7566 03-12月-81 3000 20 EMPNO ENAME JOB MGR HIREDATE SAL COMM ---------- ---------- --------- ---------- -------------- ---------- ---------- DEPTNO ---------- 7934 MILLER CLERK 7782 23-1月 -82 1300 10 已选择10行。 SQL> set linesize 120 SQL> / EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ---------- --------- ---------- -------------- ---------- ---------- ---------- 7369 SMITH CLERK 7902 17-12月-80 800 20 7566 JONES MANAGER 7839 02-4月 -81 2975 20 7698 BLAKE MANAGER 7839 01-5月 -81 2850 30 7782 CLARK MANAGER 7839 09-6月 -81 2450 10 7788 SCOTT ANALYST 7566 19-4月 -87 3000 20 7839 KING PRESIDENT 17-11月-81 5000 10 7876 ADAMS CLERK 7788 23-5月 -87 1100 20 7900 JAMES CLERK 7698 03-12月-81 950 30 7902 FORD ANALYST 7566 03-12月-81 3000 20 7934 MILLER CLERK 7782 23-1月 -82 1300 10 已选择10行。 SQL> host cls SQL> exit

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