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IN OperatorThe operator IN tests the set membership. This means "equal to any member of." The set may have nulls, but they are ignored. For illustration, the statement below does not delete the rows in which the ename column is null:DELETE FROM emp WHERE ename IN (NULL, ’KING’, ’FORD’);Moreover, the expressions of the formvalue NOT IN setyield FALSE when the set contains a null. For illustration, instead of deleting the rows in which the ename column is not null and not ’KING’, the statement below deletes no rows:DELETE FROM emp WHERE ename NOT IN (NULL, ’KING’);Concatenation OperatorThe Double vertical bars (||) serve as the concatenation operator that appends one string to another. For illustration, the expression’suit’ || ’case’returns the value as shown below:’suitcase’If both the operands have datatype CHAR, the concatenation operator returns a CHAR value. Or else, it returns a VARCHAR2 value.
OPEN-FOR Statement The OPEN-FOR statements execute the multi-row query related with a cursor variable. It also allocates the resources used by the Oracle to process the query a
Creating a SQL file 1. Open a new file in Notepad++ and save it to the location c:\mysql\bin, with the name lab8script.sql (the file extension should be .sql ). Add a MySQL co
i NEED TO CREATE 3 guiS IN pl/sql sERVER PAGE FORM
Declaring Records Whenever you define a RECORD type, you may declare records of that type, as the illustration shows: DECLARE TYPE StockItem IS RECORD ( item_no INTEG
Processing Transactions This part describes how to do the transaction processing. You learn the fundamental techniques that safeguard the consistency of your database, involvin
BEGIN Parameter Description in pl sql: BEGIN: This keyword signals the beginning of the executable section of a PL/SQL block, that contains executable statements. The execut
Assignment Source Not a Literal - Variable Syntax: SET SN = SID (SUBSTRING (SN.C FROM 1 FOR 1)||'5');
Write a stored procedure that accepts the post code in which the customer resides as the input parameter. The procedure should then use an explicit cursor to display comprehensive
Example of WHEN or THEN Constraints A concrete example showing how SQL supports WHEN/THEN constraints CREATE TABLE SAL_HISTORY (EmpNo CHAR (6), Salary INTEGER NOT NULL,
EXIT The EXIT statement forces a loop to done unconditionally. Whenever an EXIT statement is encountered, the loop is done immediately and controls the passes to the next statem
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