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How to change one attribute in a table using T-SQL to allow nulls (not null --> null)? Alter table maybe?
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ALTER TABLE table_name ALTER COLUMN column_name DATA_TYPE [(COLUMN_SIZE)] NULL; In this syntax: First, specify the name of the table from which you want to change the column. Second, specify the column name with size which you want to change to allow NULL and then write NULL statement .
All you need to do is to replace [Table] with the name of your table, [Col] with the name of your column and TYPE with the datatype of the column. Execute the command and you are allowed to use NULL values for the specified column. That is all it takes to switch between NULL and NOT NULL .
add not null constraint to a column. Then follow the given steps: 1) Select the table in which you want to modify changes. 2) Click on Actions.. ---> select column ----> add.
alter table yourTableName modify column yourColumnName datatype; Apply the above syntax to modify the column to allow NULL. The query is as follows. After executing the above query, you can insert NULL value to that column because the column is modified successfully above.
-- replace NVARCHAR(42) with the actual type of your column ALTER TABLE your_table ALTER COLUMN your_column NVARCHAR(42) NULL Yes you can use ALTER TABLE as follows:
ALTER TABLE [table name] ALTER COLUMN [column name] [data type] NULL Quoting from the ALTER TABLE documentation:
NULLcan be specified inALTER COLUMNto force aNOT NULLcolumn to allow null values, except for columns in PRIMARY KEY constraints.
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