SQL

sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

-- Example
ALTER TABLE product
ALTER COLUMN description VARCHAR(250);

T-SQL Alter the column data type

ALTER TABLE dbo.MyTable ALTER COLUMN MyColumn VARCHAR(20) NOT NULL;

sql alter type of column

ALTER TABLE TableName
MODIFY COLUMN ColumnName DataType;

Change column data type sql

ALTER TABLE TableName 
ALTER COLUMN ColumnName NVARCHAR(200) [NULL | NOT NULL]

alter column type

ALTER TABLE schema.table
    ALTER COLUMN column
    DROP DEFAULT;
ALTER TABLE schema.table
    ALTER COLUMN column TYPE INTEGER[]
    USING array[column]::INTEGER[];
ALTER TABLE schema.table
    ALTER COLUMN column SET DEFAULT '{}';