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SQL ALTER TABLE Rename Column Syntax. Sometimes we want to change the name of a column. To do this in SQL, we specify that we want to change the structure of the table using the ALTER TABLE command, followed by a command that tells the relational database that we want to rename the column.o do this in SQL, we specify that we want to change the structure of the table using the ALTER TABLE command, followed by a command that tells the relational database that we want to rename the column.
The column already exists and currently will not allow null values. This is a distributed application (everyone has their own different MDB file) so I need to be able to modify the column through T-SQL. My statement to try and do this is: ALTER TABLE clients ALTER COLUMN state VARCHAR(255) NULL. However, when I view the table after running that SQL statement the table is still not allowing null values. Please don't tell me I need to drop the column before allowing null values.