The Bit Bucket

When you’re performing an INSERT, you can also get values from a query., rather than specifying the values in the INSERT statement.

In the example shown above, I’ve queried for a distinct list of order contacts and their phone number from the dbo.Orders table. I’m then inserting those values into the dbo.OrderContacts table.

These types of statements are easy to debug because I can just highlight the SELECT clause and run it to see what comes back.

2025-03-30

This is a post in the SQL Interview series. These aren’t trick or gotcha questions, they’re just questions designed to scope out a candidate’s knowledge around SQL Server and Azure SQL Database.

Section: Development Level: Medium

Question:

You have a scalar T-SQL function in SQL Server and want to change it.

Apart from permissions, what would stop you from using ALTER FUNCTION to change it?

Answer:

You can’t change from an inline function to a multi-statement function.

2025-03-29

The DELETE statement is one of the most common SQL statements. We use it to remove rows from a table.

In the example, I’ve said to delete rows from the dbo.CinemaGroups table where the value in the CinemaGroupID column is greater than 3.

You need to make sure that your DELETE statements have WHERE clauses, unless what you’re intending to do is delete all the rows in the table. You don’t want to make the common mistake where people highlight a DELETE statement in SQL Server Management Studio and forget to include the WHERE clause as well.

2025-03-28

I recently finished another Audible audio book. It was How to Land an A330 Airbus: And Other Vital Skills of the Modern Man by James May.

I need to start by saying that I am a really, really big fan of James May. After watching his Toy Stories series, I decided that when I grow up, I want to be James May. It was brilliant, inventive, and just a bunch of fun.

2025-03-27

Foreign keys are mostly used where you store the primary key of another table, and want to check that it’s valid. This is used to ensure database integrity.

For example, I might have a CustomerID stored in an Orders table, and I want to make sure that the customer already exists. In the example above, I have a Courses table and I want to make sure that the CollegeID that’s stored for each course, actually matches a college that’s already in the Colleges table. I check that the CollegeID already exists by declaring a foreign key reference to that table.

2025-03-26

This is a post in the SQL Interview series. These aren’t trick or gotcha questions, they’re just questions designed to scope out a candidate’s knowledge around SQL Server and Azure SQL Database.

Section: Administration Level: Intro

Question:

You have an Azure SQL Database.

How can you create a copy of the Azure SQL Database on the same logical server?

Answer:

The easiest option is to use the CREATE DATABASE AS COPY OF command.

2025-03-25

In the previous post, I talked about check constraints. Another type of constraint in SQL Server is a unique constraint.

What I want to specify is that a value in a column is unique i.e., no other row has that same value in that column. While a check of the values can be manually requested, the constraint is normally checked when SQL Server is inserting or updating the row.

It is also possible to specify a unique constraint at the table level, rather than at the column level. You might want a combination of columns to be unique. Single column unique constraints can be declared at either the column or the table level.

2025-03-24

This is a post in the SQL Interview series. These aren’t trick or gotcha questions, they’re just questions designed to scope out a candidate’s knowledge around SQL Server and Azure SQL Database.

Section: Administration Level: Advanced

Question:

Your session is connected to a database named PublicWorks.

You want to create a temporary stored procedure, that only lasts until your session has ended. It should be available to all other sessions while your session is still active.

2025-03-23

I previously described how column data types help define what you can put in a column. But sometimes I need to be more specific.

For example, if I have an ExternalCourseRating column and it’s an integer but it’s not allowed to be any value outside the range 1 to 4, I need to do more than just say it’s an integer because that could have a wide range of potential values.

2025-03-22

This is a post in the SQL Interview series. These aren’t trick or gotcha questions, they’re just questions designed to scope out a candidate’s knowledge around SQL Server and Azure SQL Database.

Section: Development Level: Medium

Question:

You need to add a new column to a table.

A developer insists that the column needs to be inserted into the middle of the existing table, not as a new column at the end.

2025-03-21