The statement ALTER TABLE .. ADD INDEX can be used to add an index on the table t1. EXPLAIN confirms that the original query now uses an index range scan, which is more efficient: { {< copyable "sql" ...

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Adds columns to, drops columns from, and changes column attributes in an existing table. Adds, modifies, and drops integrity constraints from an existing table. Restriction: You cannot use any type of ...

This statement can be embedded in an application program or issued through the use of dynamic SQL statements. It is an executable statement that can be dynamically prepared. ALTER privilege on the ...

You create a CLOB in Oracle through the database's Structured Query Language, or SQL. Using SQL's "ALTER TABLE" statement, you add a CLOB data item to an existing table in your business' database.