SQL How to correctly use TRY/CATCH/THROW statement and Next

Question

I am trying to utilize a TRY/CATCH/THROW statement with SQL but I am unfamiliar with exactly how to input everything for the most efficient code, as well as what code would be paired with each of those methods.

My current code is

BEGIN TRY
    Insert Into ENT_ITEM_MASTER
    from Sheet1$
    WHERE ITEM_CODE = ENT_ITEM_MASTER
END TRY

BEGIN CATCH
    If ITEM_CODE <> ENT_ITEM_MASTER
        THROW;
END CATCH;

What I want it to do is that if ITEM_CODE <> ENT_ITEM_MASTER then it will skip that item code and go to the next one.

If someone could explain how to correctly throw that exception and add a little detail of what exactly CATCH and THROW do so I could better understand what exactly they are used for, that would be incredibly helpful.

I have a linked server to an Excel file with 16,000 rows of information. My code inserts that info into an item list. It links with another program so that, if I search for an item code, all of the info on it will come up.

EDIT to address answer. Trial code:

Insert Into ENT_ITEM_MASTER
from Sheet1$
WHERE ITEM_CODE = ENT_ITEM_MASTER


If ITEM_CODE <> ENT_ITEM_MASTER
    Insert Into ENT_ITEM_MASTER
    from Sheet1$
    WHERE ITEM_CODE = ENT_ITEM_MASTER
Else

Answer 1

Are you sure a try/catch/throw is necessary? It appears you could do a for loop that loops for each row with a nested if statement inside to check If ITEM_CODE <> ENT_ITEM_MASTER. If the condition is met then Insert Into ENT_ITEM_MASTER from Sheet1$ WHERE ITEM_CODE = ENT_ITEM_MASTER Else ( ). Does that make sense?

Answer 2

After rethinking through your problem I believe a case statement is best.

Try: CASE WHEN ITEM_CODE = ENT_ITEM_MASTER THEN Insert Into ENT_ITEM_MASTER from Sheet1$ WHERE ITEM_CODE = ENT_ITEM_MASTER END