SQL Drop Index Syntax

The SQL syntax for ALTER TABLE Dop Index is

ALTER TABLE "table_name"
DROP INDEX " INDEX_NAME "

Let's look at the example. Assuming our starting point is the "customer" table created in the CREATE TABLE section:

Table customer

Column Name	Data Type
First_Name	char(50)
Last_Name	char(50)
Address	char(50)
City	char(50)
Country	char(25)
Birth_Date	date

Assume we want to drop the index created in the ALTER TABLE ADD INDEX section. To do this, we type in the following:

ALTER table customer DOP INDEX IDX_COUNTRY;

Please note that using ALTER TABLE to drop an index is not supported in Oracle or SQL Server.