What is decode function in Oracle 11g?

What is decode function in Oracle 11g?

DECODE compares expr to each search value one by one. If expr is equal to a search , then Oracle Database returns the corresponding result . If no match is found, then Oracle returns default . If default is omitted, then Oracle returns null.

What is decode function Oracle?

In Oracle, DECODE function allows us to add procedural if-then-else logic to the query. DECODE compares the expression to each search value one by one. If expression is equal to a search, then the corresponding result is returned by the Oracle Database. If a match is not found, then default is returned.

Can we use decode in Plsql?

The DECODE function can be used in Oracle/PLSQL.

Can decode function be used in where clause?

And Decode works in a similar fashion, although I think it’s less readable. SELECT (columns list) FROM AGREEMENT A WHERE A. ACCOUNT = 545 AND A. GRP_ID = DECODE(?, 0, A.

What is difference between decode and case?

CASE is a statement while DECODE is a function. CASE can work with logical operators other than ‘=’ : DECODE performs an equality check only. CASE is capable of other logical comparisons such as < ,> ,BETWEEN , LIKE etc.

What is Oracle DECODE function?

Oracle decode function converts actual expression and search value to the data type of first search value before the comparison and it converts the return value to first search result data type. Given below is the example of Oracle decode:

What type of data type does Oracle decode return string?

If search value, actual expression and the result can be any one of the data types such as char, varchar2, nchar or nvarchar. At that time oracle decode function returned string is varchar2 data types and it is the same character set as the first search result parameter.

What are the rules and regulations for The DECODE function?

Rules and Regulations for decode 1 Decode function returns the value that has the same data type as the first search result from the list. 2 If the first search result is null then its return value is converted to varchar2 data type. 3 If the first search result data type is char at that time return value is converted to varchar2.

What are the different types of arguments in Oracle DECODE function?

Basically decode function is used to find any match value by using if – then – else statement. Different types of arguments that we use in Oracle decode function are as follows: 1. Numeric Types It is used as a number, binary_float or binary_double.