Matthew McGiffen DBA

Blogs

Convert SQL Audit Files to a CSV Using Read-SqlXEvent

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SQL Server Audit is an efficient way to track and log events that occur...

Control Flow Restartability in Azure Data Factory

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I presented at SQL Saturday Pittshburgh this past weekend about populating your data warehouse...

Monday Monitor Tips: Knowing Your RPO

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A customer was asking recently about the RPO for their estate, and I showed...

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Forums

how to query that stores mulit select field data

By mathewspsimon

Hi everyone, I have a table as below, I would like to strip out...

Getting all ancestral parents of a table

By jaango123

From this link - https://stackoverflow.com/questions/22005698/how-to-find-all-the-dependencies-of-a-table-in-sql-server I can find all the child dependencies starting from my...

Something Odd About CAST/TRY_CAST

By Chris Wooding

I've got some code that is supposed to generate a unique key by prefixing...

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Question of the Day

STRING_AGG's behavior

Executing the following script (Sql Server 2022), you get the table t0 with 10 rows:
CREATE TABLE t0
( id     INT PRIMARY KEY
, field1 VARCHAR(1000)
, field2 VARCHAR(MAX));
INSERT INTO t0
SELECT
  gs.value
, REPLICATE ('X', 1000)
, REPLICATE ('Y', 1000)
FROM generate_series(1, 10, 1) gs;
GO
What happens if you execute the following statements?
  1. select STRING_AGG(field1, ';') within group (order by id)  from t0;
  2. select STRING_AGG(field2, ';') within group (order by id)  from t0;

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