如果SQL Server存储过程中的其他语句

Question

In SQL Server, on .NET you can add together a SQL statement and therefor use either 'or' or 'and'.

I am stuck how to do this in a SQL Server stored procedure.

Question:

1. What is it called what you add together SQL statements? I have a feeling it starts with a 'c' concocations??

2. I believe I am close with the below code to having a 'variable' SQL?

Code:

BEGIN
    SELECT * 
    FROM TblEmployee
    WHERE 
       FirstName LIKE  '%' + LTRIM(RTRIM((@sFirstName))) + '%'   
       or
       Surname LIKE '%' + LTRIM(RTRIM((@sSurname ))) + '%'   
       and
       IF (LTRIM(RTRIM((@sOfficeBase))) = 'xyz1234') 
       and OfficeBase = LTRIM(RTRIM((@sOfficeBase)))
       ELSE
       or
       OfficeBase= LTRIM(RTRIM((@sOfficeBase)))
END  

There are simular queries such as If else in stored procedure sql server

But I have a feeling I searching for the 'wrong' question. Thanks in advance

Answer 1

The where clause allows you to embed conditional logic - you don't need if/then/else, which is just as well, because afaik, that's not supported by any SQL dialect in a where clause.

BEGIN
    SELECT * 
    FROM TblEmployee
    WHERE 
       FirstName LIKE  '%' + LTRIM(RTRIM((@sFirstName))) + '%'   
       or
       Surname LIKE '%' + LTRIM(RTRIM((@sSurname ))) + '%'   
       and
       (OfficeBase = 'xyz1234' 
       or
       OfficeBase= LTRIM(RTRIM((@sOfficeBase)))
END  

Answer 2

I am pretty sure you have some missing parenthesis in your original query. Not sure why you are adding LTRIM and RTRIM to your parameters. Taking a shot in the dark I suspect you could boil down your query to this.

SELECT * --This should be the column names actually needed, * is not good for production code
FROM TblEmployee 
WHERE 
(
    FirstName LIKE  '%' + @sFirstName + '%'   
    or
    Surname LIKE '%' + @sSurname + '%'   
)
and OfficeBase in ('xyz1234', @sOfficeBase)