What is the equivalent of Decode in SQL Server?
CASE statement
In SQL Server the equivalent code is CASE statement. Here are the examples regarding how DECODE can be written in SQL Server.
Does decode work in SQL Server?
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. It is not recognized and supported in other database management servers such as PostgreSQL, SQL Server, MySQL etc.
Can we use decode inside decode?
It is possible to use DECODE, but you’d have to use nested DECODEs and you’d end up with something that’s much harder to read, understand and therefore maintain.
What are the differences between case and decode in SQL?
CASE VS DECODE
CASE | DECODE |
---|---|
CASE can be used as constructs in PL SQL blocks | DECODE can be part of SQL statements only. Though the SQL can be used in PL SQL |
CASE can handle predicates (like IN) and searchable subqueries | DECODE Cannot handle Predicates and searches. |
Can we use like in decode?
select …, case when user_comments like ‘%RELEASE-1’ then ‘F’ when user_comments like ‘%RELEASE-4’ then ‘P’ else ‘X’ end from…. but you can decode: select …., decode( sign(instr( user_comments, ‘RELEASE-1’ )), 1, ‘F’, decode( sign(instr(user_comments,’RELEASE-4′)), 1, ‘P’, ‘X’ ) from ….
What is coalesce in SQL Server?
The COALESCE() function returns the first non-null value in a list.
What is the difference between decode and case with examples?
DECODE can check equality operators only where as CASE can support all relational operators DECODE can be used in sql only where as CASE can be used in SQL AND PL/SQL CASE is better than DECODE. -1 for “…and can not use the DECODE in the where clause.” DECODE is a function and every function has a return value.
What is SQL decode?
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. If default is omitted, then Oracle returns null.
Is decode faster than case when?
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. To clarify: DECODE can be faster than a CASE, but a simple CASE may be translated internally to DECODE, yielding the same performance.
Can we use like operator in case statement in Oracle?
No, there isn’t… You can put all the conditions in a single OR instead, but that’s it.
Should I use Isnull or coalesce?
advantage that COALESCE has over ISNULL is that it supports more than two inputs, whereas ISNULL supports only two. Another advantage of COALESCE is that it’s a standard function (namely, defined by the ISO/ANSI SQL standards), whereas ISNULL is T-SQL–specific.
Which is best decode or case?