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DBMS SQL Update

DBMS SQL Update with DBMS Overview, DBMS vs Files System, DBMS Architecture, Three schema Architecture, DBMS Language, DBMS Keys, DBMS Generalization, DBMS Specialization, Relational Model concept, SQL Introduction, Advantage of SQL, DBMS Normalization, Functional Dependency, DBMS Schedule, Concurrency Control etc.

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SQL Update Statement

The SQL UPDATE statement is used to modify the data that is already in the database. The condition in the WHERE clause decides that which row is to be updated.

Syntax

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

Sample Table

EMPLOYEE

EMP_ID EMP_NAME CITY SALARY AGE
1 Angelina Chicago 200000 30
2 Robert Austin 300000 26
3 Christian Denver 100000 42
4 Kristen Washington 500000 29
5 Russell Los angels 200000 36
6 Marry Canada 600000 48

Updating single record

Update the column EMP_NAME and set the value to 'Emma' in the row where SALARY is 500000.

Syntax

UPDATE table_name  
SET column_name = value 
WHERE condition;

Query

UPDATE EMPLOYEE 
SET EMP_NAME = 'Emma' 
WHERE SALARY = 500000;

Output: After executing this query, the EMPLOYEE table will look like:

EMP_ID EMP_NAME CITY SALARY AGE
1 Angelina Chicago 200000 30
2 Robert Austin 300000 26
3 Christian Denver 100000 42
4 Emma Washington 500000 29
5 Russell Los angels 200000 36
6 Marry Canada 600000 48

Updating multiple records

If you want to update multiple columns, you should separate each field assigned with a comma. In the EMPLOYEE table, update the column EMP_NAME to 'Kevin' and CITY to 'Boston' where EMP_ID is 5.

Syntax

UPDATE table_name  
SET column_name = value1, column_name2 = value2  
WHERE condition;

Query 

UPDATE EMPLOYEE 
SET EMP_NAME = 'Kevin', City = 'Boston' 
WHERE EMP_ID = 5;

Output

EMP_ID EMP_NAME CITY SALARY AGE
1 Angelina Chicago 200000 30
2 Robert Austin 300000 26
3 Christian Denver 100000 42
4 Kristen Washington 500000 29
5 Kevin Boston 200000 36
6 Marry Canada 600000 48

Without use of WHERE clause

If you want to update all row from a table, then you don't need to use the WHERE clause. In the EMPLOYEE table, update the column EMP_NAME as 'Harry'.

Syntax

UPDATE table_name  
SET column_name = value1;

Query 

UPDATE EMPLOYEE 
SET EMP_NAME = 'Harry';

Output

EMP_ID EMP_NAME CITY SALARY AGE
1 Harry Chicago 200000 30
2 Harry Austin 300000 26
3 Harry Denver 100000 42
4 Harry Washington 500000 29
5 Harry Los angels 200000 36
6 Harry Canada 600000 48

Next TopicDBMS SQL Delete




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