SQL

DROP TABLE IF EXISTS emp;
CREATE TABLE emp(eid integer,ename varchar(20),sal integer,ecountry varchar(200));
INSERT INTO emp VALUES (1,'XYZ',20000,'INDIA');
INSERT INTO emp VALUES (2,'XYZ1',2000,'ENGLAND');
INSERT INTO emp VALUES (3,'XYZ2',2000,'INDIA');
INSERT INTO emp VALUES (4,'XYZ3',20000,'ENGLAND');
INSERT INTO emp VALUES (5,'XYZ4',20000 ,'RUSSIA');
INSERT INTO emp VALUES (6,'XYZ5',20000 ,'SRI LANKA');

SELECT * FROM emp;
SELECT * FROM emp WHERE eid=1;
SELECT * FROM emp WHERE ename='XYZ5';
SELECT eid,ename FROM emp;
SELECT * FROM emp WHERE sal<10000;
SELECT DISTINCT ecountry FROM emp;
SELECT DISTINCT ename FROM emp;
SELECT COUNT(DISTINCT ecountry) FROM emp;
SELECT COUNT(DISTINCT ename) FROM emp;
SELECT * FROM emp WHERE ecountry='INDIA';
DROP TABLE IF EXISTS emp;
CREATE TABLE emp(eid integer,ename varchar(20),sal integer,ecountry varchar(200));
INSERT INTO emp VALUES (1,'XYZ',20000,'INDIA');
INSERT INTO emp VALUES (2,'XYZ1',2000,'ENGLAND');
INSERT INTO emp VALUES (3,'XYZ2',2000,'INDIA');
INSERT INTO emp VALUES (4,'XYZ3',20000,'ENGLAND');
INSERT INTO emp VALUES (5,'XYZ4',20000 ,'RUSSIA');
INSERT INTO emp VALUES (6,'XYZ5',20000 ,'SRI LANKA');

SELECT * FROM emp;
SELECT * FROM emp WHERE eid=1;
SELECT * FROM emp WHERE ename='XYZ5';
SELECT eid,ename FROM emp;
SELECT * FROM emp WHERE sal<10000;
SELECT DISTINCT ecountry FROM emp;
SELECT DISTINCT ename FROM emp;
SELECT COUNT(DISTINCT ecountry) FROM emp;
SELECT COUNT(DISTINCT ename) FROM emp;
SELECT * FROM emp WHERE ecountry='INDIA';



OUTPUT:

eid	ename	sal	ecountry
1	XYZ	20000	INDIA
2	XYZ1	2000	ENGLAND
3	XYZ2	2000	INDIA
4	XYZ3	20000	ENGLAND
5	XYZ4	20000	RUSSIA
6	XYZ5	20000	SRI LANKA

eid	ename	sal	ecountry
1	XYZ	20000	INDIA

eid	ename	sal	ecountry
6	XYZ5	20000	SRI LANKA

eid	ename
1	XYZ
2	XYZ1
3	XYZ2
4	XYZ3
5	XYZ4
6	XYZ5

eid	ename	sal	ecountry
2	XYZ1	2000	ENGLAND
3	XYZ2	2000	INDIA

ecountry
INDIA
ENGLAND
RUSSIA
SRI LANKA

ename
XYZ
XYZ1
XYZ2
XYZ3
XYZ4
XYZ5

COUNT(DISTINCT ecountry)
4

COUNT(DISTINCT ename)
6

eid	ename	sal	ecountry
1	XYZ	20000	INDIA
3	XYZ2	2000	INDIA