I've seen issues repeatedly with "SELECT ... INTO <new_table>" causing blocking (on SQL 2016).  When we adjust the code to split the table creation...

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I've seen issues repeatedly with "SELECT ... INTO <new_table>" causing blocking (on SQL 2016).  When we adjust the code to split the table creation and the...

I've seen issues repeatedly with "SELECT ... INTO <new_table>" causing blocking (on SQL 2016).  When we adjust the code to split the table creation and the table load...

I've seen issues repeatedly with "SELECT ... INTO <new_table>" causing blocking (on SQL 2016).  When we adjust the code to split the table creation and the table load...

Derrick Smith (9/15/2010)

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Jeff Moden (9/14/2010)

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Derrick Smith (9/14/2010)

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It's the combination of that and creating it in a transaction thats causing the issue here. SQL needs to keep the lock on...

I've seen issues repeatedly with "SELECT ... INTO <new_table>" causing blocking (on SQL 2016).  When we adjust the code to split the table creation and the table load the problems...

ScottPletcher that is not entirely true and that is not what I was talking to. I was looking at the bigger picture or the why are they creating these...

You don't really need to partition the table if you (1) cluster the table by date first and (2) the lookup queries specify a WHERE clause on a date or...

(1) You could use dynamic SQL and change the table name literally in the code before executing it.

(2) Or you could instead use a synonym to point to the active...

SELECT 
    CAST(Time_2 AS date) AS Date,
    CAST(SUM(CASE WHEN DATEPART(HOUR, Time_2) = 1 THEN Unit ELSE 0 END) AS decimal(9, 3))...

Since you're only doing INSERT and not UPDATE, you don't need MERGE.

I really can't follow the different tables you have since there's only one source table for all the columns...

You'll need to CAST any text column(s) to varchar(max) in the PARTITION BY.

;WITH cte_count_dups AS (
    SELECT 
        *, COUNT(*) OVER(PARTITION BY Nationalnumber, Birthdate, Mobilphone, Emailaddress, Firstname) AS dup_count
...

Not a lot of details.  Maybe something like this:

SELECT 
    NationalNumber
FROM Contact
GROUP BY NationalNumber
HAVING /*COUNT(*) > 1 AND*/
    ((COUNT(DISTINCT Birthdate) >...