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POSQL Server 2012 AFTER INSERT trigger when inserting multiple rows
 

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  1. POSQL Server 2012 AFTER INSERT trigger when inserting multiple rows
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    <p>I'm using the search function in stackoverflow, but I can't find the answer for my problem. But I'm sure I cannot be the first one with this problem.</p> <p>In my SQL Server 2012 I'm inserting rows and I have an after insert trigger. The inserted pseudo table contains one row with inter alia a timestamp.</p> <p>With my function the timestamp result a dataset between 1 and x rows, on row for each quarter of an hour. With an cross join i have an multiple row dataset trying to insert into a target table.</p> <p>To keep in mind:<br> With an insert of one row in my source table I fire my trigger. The inserted table contains one row. I try to insert multiple rows in the target table.</p> <p>Error message: </p> <blockquote> <p>Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, &lt;, &lt;= , >, >= or when the subquery is used as an expression.</p> </blockquote> <p>The code</p> <pre><code> -- Insert statements for trigger here DECLARE @state_time DATETIME,@end_time DATETIME SET @state_time = (SELECT state_time from inserted) SET @end_time = (SELECT end_time from inserted) BEGIN TRY INSERT INTO t_Duration SELECT i.interval ,t1.call_id ,t1.agent_id ,t1.service_id ,t1.state ,i.duration FROM (SELECT * FROM myFUnction(@state_time, @end_time, 15)) AS i -- here i get more than one row CROSS JOIN (SELECT * from inserted) AS t1 END TRY BEGIN CATCH END CATCH </code></pre> <p>Why? Is it not possible to insert multiple rows with a trigger? If I copy the <code>INSERT INTO</code> and fake the inserted table with an table variable, the insert execute successful.</p> <p>I searching a while and it looks like I need a cursor. Is this right. there are alternatives?</p> <p>Do you have a clue for me?</p> <p>Thank you Frank</p> <p>=== edit</p> <p>I should explain what I'm doing... I get callrecords with an state, lets say "connect", the call_id and a start timestamp and the endtimestamp. i have to report the duration. i wrote a table value function with three parameters start, end and the duration of the interval in minutes.</p> <p>as a result set, i get an dataset with one row per interval. it contains a interval_is (i crate an unique id for each interval since 1970) and the duration if a call overlapping a interval.</p> <p>the insertet dataset in the source table:</p> <pre><code>--------------------------------------------------------------- | call_id | state | starttime | endtime | --------------------------------------------------------------- | 4711 | 4 | 2013-10-31 09:25:12 | 2013-10-31 09:32:24 | --------------------------------------------------------------- </code></pre> <p>the function results the follwing result:</p> <pre><code>-------------------------- | interval_id | duration | -------------------------- | 3991333 | 288 | -------------------------- | 3991334 | 144 | -------------------------- </code></pre> <p>with an cross join a try to insert into target table:</p> <pre><code>--------------------------------------------- | interval_id | state | call_id | duration | --------------------------------------------- | 3991333 | 4 | 4711 | 288 | --------------------------------------------- | 3991334 | 4 | 4711 | 144 | --------------------------------------------- </code></pre> <p>and it fails.</p>
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    1. COIs there one (or multiple) common columns between the `myFunction` result set and the `Inserted` pseudo table? I would think you should be able to use a simple join (rather than a `CROSS JOIN`) here... Also: what exactly does `myFunction` do??
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    2. COFurthermore: what row of your `Inserted` table do you think this statement will select? `SET @state_time = (SELECT state_time from inserted)` This is really really bad code - `Inserted` can contain **multiple rows** - which `state_time` and `end_time` are being selected then???
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    3. COYou say "*The inserted pseudo table contains one row ..*", but it does not, it contains multiple rows. This is what is causing your `SET = (Select..)` subqueries to fail.
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