The DECODE function can be used in Oracle/PLSQL. You could use the DECODE function in a SQL statement as follows: SELECT supplier_name, DECODE(supplier_id, 10000, ‘IBM’, 10001, ‘Microsoft’, 10002, ‘Hewlett Packard’, ‘Gateway’) result FROM suppliers; The DECODE function will compare each supplier_id value, one by one.
Can we use decode in select statement?
DECODE function in Standard Query Language (SQL) is used to add procedural IF – THEN – ELSE like statements to a query. However, we should keep in mind that DECODE is a built-in function in ORACLE SQL databases and hence it is supported only in ORACLE 9i and above versions of ORACLE/ PL SQL.
What is decode in Oracle SQL?
What is DECODE function in SQL? 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.
How does the decode function work in Oracle?
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.
Can we use decode in where clause in SQL?
2 Answers. And Decode works in a similar fashion, although I think it’s less readable. SELECT (columns list) FROM AGREEMENT A WHERE A.
Where do we use decode and case statements?
CASE is a statement and DECODE is a function We can use the CASE in the where clause and can not use the DECODE in the where clause.
What is the difference between Case and decode in Oracle?
From performance perspective, In Oracle decode and CASE does not make any difference. But in Exadata , Decode is faster than CASE. The Decode operation is done at storage Server level where the data is present BUT CASE is done at DB Instance level which receives data from DB storage Level.
Where do you use decode and case in Oracle?
Is decode ANSI SQL?
Question: Is “Decode” ansi standard sql? Answer: The answer is No. It is specific to Oracle. These extensions are very helpful in quickly retrieving and formatting data, but they also have drawbacks to the database.
Where do you use decode and case statements?
How to use DECODE function in a SQL statement?
You could use the DECODE function in a SQL statement as follows: SELECT supplier_name, DECODE(supplier_id, 10000, ‘IBM’, 10001, ‘Microsoft’, 10002, ‘Hewlett Packard’, ‘Gateway’) result FROM suppliers; The above DECODE statement is equivalent to the following IF-THEN-ELSE statement:
How to use DECODE function in Oracle/PLSQL?
The DECODE function can be used in Oracle/PLSQL. You could use the DECODE function in a SQL statement as follows: SELECT supplier_name, DECODE (supplier_id, 10000, ‘IBM’, 10001, ‘Microsoft’, 10002, ‘Hewlett Packard’, ‘Gateway’) result FROM suppliers; The above DECODE statement is equivalent to the following IF-THEN-ELSE statement:
What happens if default is omitted in SQL?
If default is omitted, then the DECODE function will return NULL (if no matches are found). The DECODE function returns a value that is the same datatype as the first result in the list. If the first result is NULL, then the return value is converted to VARCHAR2.
How can I use The DECODE function for ranges of numbers?
Answer: Unfortunately, you can not use the DECODE function for ranges of numbers. However, you can try to create a formula that will evaluate to one number for a given range, and another number for the next range, and so on.
