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AND TRUE if all the conditions separated by AND is TRUE

OR

Warning: C:\Program Files\MySQL\MySQL Server 5.6\bin\mysql.exe: ignoring option

'--no-beep' due to invalid value ''

Enter password: ********

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 6

Server version: 5.6.51-log MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> \c

mysql> selec \c

mysql> use vlrinst;

Database changed

mysql> select * from emp;

+-------+--------+-----------+------+------------+---------+---------+--------+

| empno | ename  | job       | mgr  | hiredate   | sal     | comm    | deptno |

+-------+--------+-----------+------+------------+---------+---------+--------+

|  7369 | SMITH  | CLERK     | 7902 | 1980-12-17 |  800.00 |    NULL |     20 |

|  7499 | ALLEN  | SALESMAN  | 7698 | 1981-02-20 | 1600.00 |  300.00 |     30 |

|  7521 | WARD   | SALESMAN  | 7698 | 1981-02-22 | 1250.00 |  500.00 |     30 |

|  7566 | JONES  | MANAGER   | 7839 | 1981-04-02 | 2975.00 |    NULL |     20 |

|  7654 | MARTIN | SALESMAN  | 7698 | 1981-09-28 | 1250.00 | 1400.00 |     30 |

|  7698 | BLAKE  | MANAGER   | 7839 | 1981-05-01 | 2850.00 |    NULL |     30 |

|  7782 | CLARK  | MANAGER   | 7839 | 1981-06-09 | 2450.00 |    NULL |     10 |

|  7788 | SCOTT  | ANALYST   | 7566 | 1982-12-09 | 3000.00 |    NULL |     20 |

|  7839 | KING   | PRESIDENT | NULL | 1981-11-17 | 5000.00 |    NULL |     10 |

|  7844 | TURNER | SALESMAN  | 7698 | 1981-09-08 | 1500.00 |    0.00 |     30 |

|  7876 | ADAMS  | CLERK     | 7788 | 1983-01-12 | 1100.00 |    NULL |     20 |

|  7900 | JAMES  | CLERK     | 7698 | 1981-12-03 |  950.00 |    NULL |     30 |

|  7902 | FORD   | ANALYST   | 7566 | 1981-12-03 | 3000.00 |    NULL |     20 |

|  7934 | MILLER | CLERK     | 7782 | 1982-01-23 | 1300.00 |    NULL |     10 |

+-------+--------+-----------+------+------------+---------+---------+--------+

14 rows in set (0.00 sec)

mysql> select ename from emp where job="clerk" and mgr=7902;

+-------+

| ename |

+-------+

| SMITH |

+-------+

1 row in set (0.00 sec)

mysql> select ename from emp where job="clerk" or mgr=7902;

+--------+

| ename  |

+--------+

| SMITH  |

| ADAMS  |

| JAMES  |

| MILLER |

+--------+

4 rows in set (0.00 sec)

mysql> select ename from emp where job="clerk" or mgr=7698;

+--------+

| ename  |

+--------+

| SMITH  |

| ALLEN  |

| WARD   |

| MARTIN |

| TURNER |

| ADAMS  |

| JAMES  |

| MILLER |

+--------+

8 rows in set (0.00 sec)

mysql> select ename,job,mgr from emp where job="clerk" or mgr=7698;

+--------+----------+------+

| ename  | job      | mgr  |

+--------+----------+------+

| SMITH  | CLERK    | 7902 |

| ALLEN  | SALESMAN | 7698 |

| WARD   | SALESMAN | 7698 |

| MARTIN | SALESMAN | 7698 |

| TURNER | SALESMAN | 7698 |

| ADAMS  | CLERK    | 7788 |

| JAMES  | CLERK    | 7698 |

| MILLER | CLERK    | 7782 |

+--------+----------+------+

8 rows in set (0.00 sec)

mysql> select ename,job,mgr from emp where job="clerk" || mgr=7698;

+--------+----------+------+

| ename  | job      | mgr  |

+--------+----------+------+

| SMITH  | CLERK    | 7902 |

| ALLEN  | SALESMAN | 7698 |

| WARD   | SALESMAN | 7698 |

| MARTIN | SALESMAN | 7698 |

| TURNER | SALESMAN | 7698 |

| ADAMS  | CLERK    | 7788 |

| JAMES  | CLERK    | 7698 |

| MILLER | CLERK    | 7782 |

+--------+----------+------+

8 rows in set (0.00 sec)

mysql> select ename,job,mgr from emp where job="clerk" && mgr=7698;

+-------+-------+------+

| ename | job   | mgr  |

+-------+-------+------+

| JAMES | CLERK | 7698 |

+-------+-------+------+

1 row in set (0.00 sec)

mysql> select ename,job,mgr from emp where job="clerk" && mgr=7699;

Empty set (0.00 sec)

mysql> select 1 && 1;

+--------+

| 1 && 1 |

+--------+

|      1 |

+--------+

1 row in set (0.00 sec)

mysql> select 1 && 0;

+--------+

| 1 && 0 |

+--------+

|      0 |

+--------+

1 row in set (0.00 sec)

mysql> select 0 && 0;

+--------+

| 0 && 0 |

+--------+

|      0 |

+--------+

1 row in set (0.00 sec)

mysql> select 1 && 1 && 1 && 1;

+------------------+

| 1 && 1 && 1 && 1 |

+------------------+

|                1 |

+------------------+

1 row in set (0.00 sec)

mysql> select 1 && 1 && 1 && 0;

+------------------+

| 1 && 1 && 1 && 0 |

+------------------+

|                0 |

+------------------+

1 row in set (0.00 sec)

mysql> select 1 || 1 || 1 || 0;

+------------------+

| 1 || 1 || 1 || 0 |

+------------------+

|                1 |

+------------------+

1 row in set (0.00 sec)

mysql> select 0 || 0 || 1 || 0;

+------------------+

| 0 || 0 || 1 || 0 |

+------------------+

|                1 |

+------------------+

1 row in set (0.00 sec)

mysql> select 0 || 0 || 0 || 0;

+------------------+

| 0 || 0 || 0 || 0 |

+------------------+

|                0 |

+------------------+

1 row in set (0.00 sec)

mysql> select 1 || 0 && 1 || 0;

+------------------+

| 1 || 0 && 1 || 0 |

+------------------+

|                1 |

+------------------+

1 row in set (0.00 sec)

mysql> select 1 || 0 && 0 || 0;

+------------------+

| 1 || 0 && 0 || 0 |

+------------------+

|                1 |

+------------------+

1 row in set (0.00 sec)

mysql> select (1 || 0) && (0 || 0);

+----------------------+

| (1 || 0) && (0 || 0) |

+----------------------+

|                    0 |

+----------------------+

1 row in set (0.00 sec)

mysql> select 1 || 0 && 0 || 0;

+------------------+

| 1 || 0 && 0 || 0 |

+------------------+

|                1 |

+------------------+

1 row in set (0.00 sec)

mysql>