sql alter column

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Lorenzo Satta Chiris answered on June 1, 2020 Popularity 10/10 Helpfulness 3/10

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Changes the data type of a table’s column.
Example: In the ‘users’ table, make the column ‘incept_date’ into a
‘datetime’ type.
ALTER TABLE users
ALTER COLUMN incept_date datetime;

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Contributed on Jan 07 2021

Lorenzo Satta Chiris

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sql server alter column

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ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

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Source: www.sqlservertutorial.net

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Contributed on Jun 01 2020

Weary Wryneck

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SQL Modify Column in a Table

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#SQL Server

ALTER TABLE Customers
ALTER COLUMN age VARCHAR(2);

#MySQL

ALTER TABLE Customers
MODIFY COLUMN age VARCHAR(2);

#Oracle

ALTER TABLE Customers
MODIFY age VARCHAR(2);

#PostgreSQL

ALTER TABLE Customers
ALTER COLUMN age TYPE VARCHAR(2);

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Contributed on May 22 2022

SAMER SAEID

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sql change column

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-- Change column type
ALTER TABLE table_name
ALTER COLUMN some_col VARCHAR(250);

-- Change column name
ALTER TABLE table_name
RENAME COLUMN old_column_name TO new_column_name;

-- Change column values
UPDATE table_name
SET col_name=LOWER(col_name);

-- Add column
ALTER TABLE table_name
ADD COLUMN new_col INTEGER;

-- DELETE column
ALTER TABLE table_name
DROP COLUMN col_name;

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Contributed on Feb 17 2024

Innocent Iguana

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alter table

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ALTER TABLE table_name MODIFY column_name datatype NOT NULL;

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Contributed on Mar 07 2022

Bright Buffalo

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alter table

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ALTER TABLE table_name MODIFY COLUMN column_name datatype;

Popularity 10/10 Helpfulness 4/10 Language sql

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Contributed on Mar 07 2022

Bright Buffalo

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alter table

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ALTER TABLE table_name 
ADD CONSTRAINT MyUniqueConstraint CHECK (CONDITION);

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Contributed on Mar 07 2022

Bright Buffalo

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alter table

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-2

ALTER TABLE table_name 
ADD CONSTRAINT MyPrimaryKey PRIMARY KEY (column1, column2...);

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Contributed on Mar 07 2022

Bright Buffalo

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sql alter table

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-- With check if field already exists

IF NOT EXISTS(SELECT 1 FROM sys.columns 
          WHERE Name = N'Email'
          AND Object_ID = Object_ID(N'dbo.Customers'))
BEGIN    
	ALTER TABLE Customers
    ADD Email varchar(255);
END

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Contributed on Nov 26 2020

Lucky Lark

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alter table

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ALTER TABLE table_name 
DROP PRIMARY KEY;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: www.tutorialspoint.com

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Contributed on Mar 07 2022

Bright Buffalo

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sql alter column

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