Dropping Tables in Bulk

Let’s assume that you have lots of tables that need to be dropped according to some...

Tutorial on SQL (DDL, DML) on the example of MS SQL Server dialect

Introduction This tutorial includes information about SQL (DDL, DML) that I have gathered during my professional life. This is the minimum you need to know while working with databases....

Maximum Number of Rows for the Table Value Constructor

What is the maximum number of rows for the Table Value Constructor? And, do different uses of it behave differently?… Continue reading Maximum Number of Rows for the Table...
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Strange Sorting

T-SQL bugs, pitfalls and best practices – subqueries

Itzik Ben-Gan resumes his blog series on T-SQL bugs, pitfalls, and best practices, treating an issue with correlated column references in subqueries.
The post T-SQL bugs, pitfalls and best practices...

Temporary Staging Tables

Watch this week’s episode on YouTube. SQL Server Spool operators are a mixed bag. On one hand, they can negatively impact performance when writing data to disk in tempdb....
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T-SQL Tuesday #114 – Puzzle Party

A few years back I started running regular SQL workshops in my workplace. Teaching beginners the basics of querying databases with SQL, as well as more advanced topics for...
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Splitting Strings With OPENJSON

Starting with SQL Server 2016, Microsoft provided a STRING_SPLIT function. It is a table-valued function that splits a string into rows of substrings, based on a specified separator character....

The Silent Bug I Find in Most Triggers

I don’t have a problem with triggers. They get the job done when you need to implement business logic in a hurry, and you’re not allowed to change the...

Parsing JSON Data In SQL Server

Microsoft added support for JSON data beginning with SQL Server 2016. JSON is an open-standard file format consisting of attribute–value pairs and array data types. It is commonly used...