When you alter the attributes of a column and an index has been defined for that column, the values in the altered column continue to have the index defined for them. If you drop a column with the ...

INFORMAT= specifies the informat to be used when SAS accesses data from a table or view. You can change one permanent informat to another by using the ALTER statement. PROC SQL stores informats in its ...

The SQL ALTER statement can be used to make many types of changes to databases. However, other types of changes may require additional steps to implement. It is the DBA’s job to understand the best ...