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Self-Referencing Foreign Keys: Managers, Employees and Deletes

July 19, 2021
Pinal Dave
SQL Tips and Tricks
Best Practices, SQL Constraint and Keys, SQL Server

Delete a manager and SQL Server says no, which is good. See how to reassign reports safely and how to catch loops the foreign key allows.

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SQL SERVER – Find Instance Name for Availability Group Listener

July 16, 2021
Pinal Dave
SQL Tips and Tricks
AlwaysOn, SQL Instance, SQL Scripts, SQL Server

An Availability Group Listener identifies a connection endpoint rather than a separate engine instance. I query where this connection actually arrived.

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SQL SERVER – Altering Column – From NULL to NOT NULL

July 13, 2021
Pinal Dave
SQL Tips and Tricks
SQL Column, SQL Scripts, SQL Server

Altering Column nullability to NOT NULL requires resolving existing NULLs under an approved data rule. A customer used empty strings.

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Read Only Tables

Read Only Tables – Is it Possible? – SQL in Sixty Seconds #179

July 9, 2021
Pinal Dave
SQL Video
SQL Data Storage, SQL in Sixty Seconds, SQL Scripts, SQL Server

After reading it, lots of people asked me if I can make a video on this topic. Of course, here we go, Read Only Tables – Is it Possible?

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SQL SERVER – Making Filegroup Read Only

July 7, 2021
Pinal Dave
SQL Tips and Tricks
SQL Data Storage, SQL Scripts, SQL Server

A filegroup read-only setting prevents writes to objects stored there. A customer asked whether a table could be protected this way.

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Work strips, paired covered intervals and a separate closure marker form a defined schedule.

SQL SERVER – Find Business Days Between Dates

July 5, 2021
Pinal Dave
SQL Tips and Tricks
SQL DateTime, SQL Scripts, SQL Server

Business Days Between Dates require a defined calendar and endpoint rule. This example counts inclusive Monday-to-Friday dates for July 2021.

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Count Sum

One Scan for 3 Count Sum – SQL in Sixty Seconds #178

July 2, 2021
Pinal Dave
SQL Tips and Tricks
Execution Plan, SQL Function, SQL in Sixty Seconds, SQL Index, SQL Scripts, SQL Server

Well, the answer is pretty straight forward and that is what we are going to see in today’s video of One Scan for 3 Count Sum.

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