Conditional ? : SSIS

Question

(ISNULL([Deal Status]) ? "2" : SUBSTRING([Deal Status],1,1)) == "2"

This is one of the outputs in a conditional split in SSIS.

I Don't understand what this means. Could you help explain this?

I understand: If Deal Status is null, return 2, else check if dealstatus is 2?

Answer 1

When using the ? and :, it's a conditional operator, the same as using an if/else statement:

condition ? true result : false result

So to breakdown what your statement is doing, it first checks to see if DealStatus IS NULL. If so, it returns a "2". If it isn't NULL, it returns the first character of the DealStatus field using SUBSTRING. Finally, it compares that result to see if it's equal to "2".

The overall expression will return a true/false. For example, if DealStatus is NULL, this will always return true.

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For example, here would be the results if the following values were stored in the DealStatus field.

DealStatus    ResultOfCondition
NULL          true (because DealStatus is NULL, we compare 2 == 2 is true)
123           false (because the first character is 1, 1 == 2 is false)
234           true (because the first character is 2, 2 == 2 is true)

Answer 2

For example, here would be the results if the following values were stored in the DealStatus field.

DealStatus=null

(ISNULL([Deal Status]) ? "2" : SUBSTRING([Deal Status],1,1)) == "2" it will verifies the first condition, DealStatus value is null so it will display(true condition) the after ? value whatever is there , In this scenario "2" is there after "?" it will display the 2.so 2=2

DealStatus=256

(ISNULL([Deal Status]) ? "2" : SUBSTRING([Deal Status],1,1)) == "2"

it will checks the first condition, but DealStatus value is not null so it will check the second condition it will produce the out put is 2 .so 2=2.

Substring Ex:-

Select SUBSTRING('258',1,1) o/p:- 2

Select SUBSTRING('589',1,1) o/p:- 5