What is CASE statement in PL SQL?
The PL/SQL CASE statement facilitates you to execute a sequence of satatements based on a selector. A selector can be anything such as variable, function or an expression that the CASE statement checks to a boolean value. The CASE statement works like the IF statement, only using the keyword WHEN.
Which is the correct declaration of cursor?
An explicit cursor should be defined in the declaration section of the PL/SQL Block. It is created on a SELECT Statement which returns more than one row.
Can we use CASE statement Plsql?
The CASE statement can be used in Oracle/PLSQL.
What are the two types of CASE statement in PL SQL?
The CASE statement has two types: simple CASE statement and searched CASE statement. Both types of the CASE statements support an optional ELSE clause.
What is simple CASE statement?
The simple CASE statement evaluates a single expression and compares it to several potential values. The searched CASE statement evaluates multiple Boolean expressions and chooses the first one whose value is TRUE .
Which of the following is the syntax of CASE statement?
Which of the following is correct syntax for CASE statement? Explanation: The CASE statement is started with the keyword CASE followed by any identifier or expression and the IS.
How do you declare a cursor variable?
A cursor variable is like an explicit cursor that is not limited to one query. To create a cursor variable, either declare a variable of the predefined type SYS_REFCURSOR or define a REF CURSOR type and then declare a variable of that type.
How is a case statement evaluated in SQL?
The CASE expression evaluates its conditions sequentially and stops with the first condition whose condition is satisfied. In some situations, an expression is evaluated before a CASE expression receives the results of the expression as its input. Errors in evaluating these expressions are possible.
What does a CASE statement do?
The CASE statement chooses from a sequence of conditions, and executes a corresponding statement. The CASE statement evaluates a single expression and compares it against several potential values, or evaluates multiple Boolean expressions and chooses the first one that is TRUE .
What kind of statement is case statement?
The CASE statement chooses from a sequence of conditions and runs a corresponding statement. The simple CASE statement evaluates a single expression and compares it to several potential values. The searched CASE statement evaluates multiple Boolean expressions and chooses the first one whose value is TRUE .
What is a case expression?
A CASE expression returns a value. CASE expression has two formats: • Simple When/Then. This format compares a value expression to a set of value expressions to determine a result.