Types de colonnes de changement SQL
ALTER TABLE table_name
ALTER COLUMN column_name datatype;
-- Example
ALTER TABLE product
ALTER COLUMN description VARCHAR(250);
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ALTER TABLE table_name
ALTER COLUMN column_name datatype;
-- Example
ALTER TABLE product
ALTER COLUMN description VARCHAR(250);ALTER TABLE table_name
ALTER COLUMN column_name new_data_type(size);
ALTER TABLE TableName
MODIFY COLUMN ColumnName DataType;ALTER TABLE TableName
ALTER COLUMN ColumnName NVARCHAR(200) [NULL | NOT NULL]
alter table my_table alter column my_column int nullALTER 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 '{}';