Which of the following is a valid SQL for an index?

Among all four options option 4 which refers to Basic index creation is the correct answer. The basic index creation is mainly used for creating a valid SQL for an index.

The basic index creation mainly involves the “CREATE INDEX” statement. This statement is followed by the name of the index and the name of the column on which the index needs to be created. Here is an example of it:-

  CREATE INDEX index _ name ON table_ name (column_ name) ;

You can replace the index name according to your preferred name for the index. In the same manner, you can also replace the table name and column name according to your requirements fornaming.

Apart from the basic create index, the other functions are the following which can prove to be valid SQL for an index.

1. Unique index

2. Partial index

3. Function-based index