How to Ignore “Duplicate Key” error in T-SQL (SQL Server)

Question

I have a transaction that contains multiple SQL Statements (INSERT, UPDATE and/or DELETES). When executing, I want to ignore Duplicate Error statements and continue onto the

Answer 1

INSERT INTO KeyedTable(KeyField, Otherfield)
SELECT n.* FROM 
    (SELECT 'PossibleDupeLiteral' AS KeyField, 'OtherfieldValue' AS Otherfield
     UNION ALL
     SELECT 'PossibleDupeLiteral', 'OtherfieldValue2'
    )
LEFT JOIN KeyedTable k
    ON k.KeyField=n.KeyField
WHERE k.KeyField IS NULL

This tells the Server to look for the same data (hopefully the same speedy way it does to check for duplicate keys) and insert nothing if it finds it.

I like the IGNORE_DUP_KEY solution too, but then anyone who relies on errors to catch problems will be mystified when the server silently ignores their dupe-key errors.

The reason I choose this over Philip Kelley's solution is that you can provide several rows of data and only have the missing ones actually get in: