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Automatically Failover (Enable or Disable) Jobs Based on HADR Role

If you have a SQL Server with a High Availability solution (AlwaysOn Availability Groups, Database Mirroring, etc.), and you also have a bunch of jobs which you need to be run on the Primary server only. You need to be able to "failover" the jobs in case the Primary server is no longer Primary.

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2018-11-14 (first published: )

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Question of the Day

ORDER BY alias

There is a table tmp_tab: 

CREATE TABLE tmp_tab (
id int,
val int
);
INSERT INTO tmp_tab VALUES
(1, 1),
(2, NULL),
(3, 3),
(4, 4),
(5, 5);
You want to order the rows ids by the following expression: 
    ISNULL(val, id) + 1
Which of the following queries produces the expected ordering and why? (Select all correct)

See possible answers