Nested CASE expression

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I have two radio buttons in UI, and column of that radio buttons in table is nullable, in getbyid stored procedure first I want to check if column is null then return null, if it is not null then check if it is zero(No) then return zero or if it is 1(YES) then return one, I think I have to use nested CASE statement for this but can't figure out actual statement, any help please? I have tried the following:

CASE WHEN TMC.CUSTOMER_ID IS NOT NULL THEN(CASE TMC.CUSTOMER_ID WHEN 0 THEN 0 
                                                                ELSE 1) 
     ELSE NULL END AS CustomerId, 

the END from the second CASE is missing

CASE 
  WHEN TMC.CUSTOMER_ID IS NOT NULL 
  THEN 
    CASE TMC.CUSTOMER_ID WHEN 0 THEN 0 ELSE 1 END
  ELSE NULL 
END                                                     AS CustomerId,

you can achieve the same result with the SIGN function

SIGN(TMC.CUSTOMER_ID) AS CustomerId

or with ABS and SIGN if the customerId could be negative

SIGN(ABS(TMC.CUSTOMER_ID)) AS CustomerId

Nested CASE Statement With ELSe (SQL Server), First, you don't need to nest case statements. Just use one case: select (CASE WHEN A IS NULL AND B IN ('C', 'D') THEN NULL WHEN A IS  Answer: Yes, you can embed CASE statements within CASE statements, nested them. Here is an example: CASE WHEN certv.id IS NOT NULL THEN NULL WHEN cert.id IS NOT NULL THEN CASE WHEN gr.gt_id = 0 THEN = 3 WHEN gr.gt_id = 1 THEN = 4 END WHEN not.id IS NOT NULL THEN NULL END as type_pre, As we see, Oracle allows nested CASE operators.

CASE
  WHEN TMC.CUSTOMER_ID IS NOT NULL THEN
      CASE WHEN TMC.CUSTOMER_ID=0 THEN 0 ELSE 1 END
END   as type_pre,

Nested case statements vs multiple criteria case statements [closed], Had an interesting discussion with a colleague today over optimizing case statements and whether it's better to leave a case statement which  The syntactic rules in the Definition of Standard ML state that the match arms of a case expression attempt to maximally consume potential clauses. And since there's no "end case" or similar marker in the language, the parser will merrily eat each of the "| pat => exp" clauses that you feed it until it sees something that terminates a list of match clauses.

Use Oracle function decode with null value as default:

 decode( TMC.CUSTOMER_ID, 0, 0, 1, 1, null)

Best way to do nested case statement logic in SQL Server, Try using COALESCE trick, like this: SELECT COALESCE(. CASE WHEN condition1 THEN calculation1 ELSE NULL END,. CASE WHEN  In essence, case statement is an optimized version of nested If statement. In SSRS, case statement is a decision function that can be reached through expressions. Important thing to mention is that in SSRS, a keyword for case statement is Switch , and not case like in other similar technologies.

Dirty Secrets of the CASE Expression, Case expressions may only be nested to level 10. In some cases, you can rewrite it as Paul suggested, with an expression like this (assuming  Simple CASE expressions can become nested over linked servers. One of the few limitations of the CASE expression is that is restricted to 10 nest levels. In this example over on dba.stackexchange.com, Paul White demonstrates (using SQL Sentry Plan Explorer) that a simple expression like this:

CASE statement in SQL Server: T-SQL Example, Nested CASE: CASE inside CASE; CASE with UPDATE; CASE with Order by. What is CASE? CASE is the extension of IFELSE statement. Appreciate you teaching me a nicer formatting method for nested CASE WHEN – Simon1979 Jan 8 '15 at 6:39. There are certainly times when this would be efficient and helpful, but in general, I like to keep logic away from my SQL queries. Just a tip for posterity.

Nested Case Statement in SQL Server, We can nest CASE statements similar to nested ifs that we find in most programming languages. Let us see an example. select ename, job, sal,  They are nested CASE WHEN clauses. And I get differing errors based on the value I pass to the specific when clause. I can't find anything 'advanced' on what I'm trying to do: or if I should just re-construct this into a series of UNION / UNION ALL statements based on the specific situation.