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INSERT INTO command:
Example:Insert the employee numbers, an increment amount of Rs.500/- and the increment date-today (which is being entered through function SYSDATE) of all the managers into a table INCR (increment due table) from the employee file.
INSERT INTO INCR SELECT EMPNO, 500, SYSDATE FROM EMP WHERE JOB = 'MANAGER';
Example: Insert values in a table using parameter substitution (& operator is used for it 1, 2 are the field numbers).
INSERT INTO EMP #VALUES (&1,'&2','&3', &4, &5, &6,NULL, &7);
Please note these values required to be supplied at run time.
UPDATE Command: Syntax is UPDATE = WHERE ;
vertical fragmentation
Identify the need and use of data control through problem solving, illustration
Suppose R is a relation with attributes A1, A2,..., An. As a function of n, tell how many superkeys R has, if: 1.1 The only key is A1. 1.2 The only key is A1 and A2. 1.3 The o
Find out the names of all employees who work for first Bank Corporation from database. SELECT EMPLOYEE_NAME FROM WORKS WHERE COMPANYNAME = ‘First Bank Corporation';
Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
How to reduce data redundency
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Create role named role_table that allows a user to create tables. Using role_table allow users kripa and reena to create tables. CREATE ROLE role_table; GRANT CREATE ANY TABLE
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
What is a Phantom Deadlock? In distributed deadlock detection, the delay in propagating local information might cause the deadlock detection algorithms to recognize deadlocks
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