What is Primary Key In SQL | SQL Class Day #16 In Telugu

Опубликовано: 17 Февраль 2026
на канале: EXCEL TELUGU VIDEOS

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This Short is About SQL Class Not Null in Integrity Constraints Day #16 (SQL series) in Telugu for SQL Developers, Data Analyst and Business Analyst. By Srinivas Reddy Excel Telugu Videos

Primary Key:
--Its a combination of NOT NULL and Unique Key

CREATE TABLE EMP3(EID INT Primary Key, ENAME VARCHAR(20), ESAL INT);

INSERT INTO EMP3 VALUES(101,'SRINIVAS',22000);

INSERT INTO EMP3 VALUES(102,'ANIL',32000);

INSERT INTO EMP3 VALUES(NULL,'ANIL',32000); //Invalid

INSERT INTO EMP3 VALUES(103,'ANIL',32000);

INSERT INTO EMP3 VALUES(103,'KISHORE',25000); //Invalid

SP_HELP EMP1

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