SSIS派生用于CASE的列表达式。

Question

I have the following SQL code that I am trying to convert inao a SSIS 2012 Derived Column Expression:

QUATER= 
        CASE
            WHEN DATEPART(M, @BD) BETWEEN 1 AND 3 THEN 'Q1'
            WHEN DATEPART(M, @BD) BETWEEN 4 AND 6 THEN 'Q2'
            ELSE 'OTHER'
        END

My Expression looks like this, and it works:

DATEPART("M", @[User::BD]) == 1 ? "Q1":
(DATEPART("M", @[User::BD]) == 2 ? "Q1":
(DATEPART("M", @[User::BD]) == 3 ? "Q1":
(DATEPART("M", @[User::BD]) == 4 ? "Q2":
(DATEPART("M", @[User::BD]) == 5 ? "Q2":
(DATEPART("M", @[User::BD]) == 6 ? "Q2" : "OTHER"
)))))

Is there a more elegant way to do this?

Answer 1

Not much more exciting, but this should be equivalent:

DATEPART("M", @[User::BD]) <= 3 ? "Q1":
(DATEPART("M", @[User::BD]) <= 6 ? "Q2" : "OTHER"
)

Likewise You could use quarter instead of month:

DATEPART("q", @[User::BD]) <= 2 ? "Q"+DATEPART("q", @[User::BD]) : "OTHER"

Can't test that string concatenation, you may need to convert the DATEPART() output to text.