SQL Questions

Cursor_Already_Open,  Invalid_Cursor.

Constraints enable the RDBMS to enforce the integrity of the database automatically, without the need to create triggers, rule or defaults.

Types of Constraints: NOT NULL, CHEQUE, UNIQUE, PRIMARY KEY, FOREIGN KEY.

- A clustered index is a special type of index that reorders the way records in the table are physically stored. Therefore table can have only one clustered index.

- A non clustered index is a special type of index in which the logical order of the index does not match the physical stored order of the rows on disk. The leaf node of a non clustered index does not consist of the data pages. Instead, the leaf nodes contain index rows.

Too_many_rows.

No_Data_Found.

Zero_Error.

By default, primary key creates a clustered index on the column, whereas a unique key creates a non clustered index by default.

Oracle SQL developer is an Oracle Database IDE.

A database is used to store, modify, extract and to search for the data within it.