It is a column that is not an actual column in the table.
eg USER, UID, SYSDATE, ROWNUM, ROWID, NULL, AND LEVEL.
Suppose customer table is there having di...
SELECT-OPTIONS: specify are displayed on the selection screen for the user to enter values.
Parameters: dname like dept-dname.
Select-options: dname for dep...
Drop Table - will remove the existence of the table from the database along with its data and structure and all the constraints. The table will be no longer ava...
DDL (Data Definition Language) statements are used to define the database structure or schema. Some examples:
1. CREATE - to create objects in the database...
Granularity The first step in designing a fact table is to determine the granularity of the fact table. By granularity, we mean the lowest level of information...
CREATE TABLE .. AS SELECT command
Explanation : To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the f...