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Read-Only Operator (+) - SQL
The term read-only operator to the mathematical term function. Here I just need to add that the SQL standard reserves the term function for read-only operators that are invoked using prefix notation: an operator name followed by a commalist of argument expressions enclosed in parentheses, as in for example SQRT(2), denoting the positive square root of 2, or SUBSTRING(X FROM 1 FOR 2) denoting the first two characters of the character string denoted by X. The term operator is used for those invoked using infix notation, like + for example.
Declaring Objects: You can use the object types wherever built-in types like CHAR or NUMBER can be used. In the block below, you can declare object r of type Rational. Then, yo
Using SET TRANSACTION You use the SET TRANSACTION statement to begin the read-only or read-write transaction, start an isolation level, or assign your present transaction to a
Structure of an Object Type: Similar to package, an object type has 2 parts: the specification and the body. The specification is the interface to your applications; it declar
Overriding Default Locking By default, the Oracle locks the data structures for you automatically. Though, you can request exact data locks on rows or tables when it is to you
Keyword and Parameter Description: label_name: This is an undeclared identifier which optionally labels the PL/SQL block. When used, label_name should be enclosed by the do
Write a cursor to open an employee database and fetch the employee record whose age is greater than 45
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Advantages of PL/SQL The PL/SQL is a high-performance transaction processing, completely portable language that offers the following advantages as shown: 1) Support for SQL
Semidifference via NOT IN and a subquery SELECT StudentId FROM IS_CALLED WHERE Name = 'Devinder' AND StudentId NOT IN (SELECT StudentId FROM IS_ENROLLED_ON WHER
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