A closure table stores ancestor and descendant paths. Read those relationships efficiently and compare them with the authoritative parent edges.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
SQL SERVER – Downgrade Database to Previous Version
Can you downgrade database files from SQL Server 2005 to 2000? No tool does it. Install the old version, recreate the schema and move the data yourself.
SQL SERVER – Introduction and Example of UNION and UNION ALL
A simple example of UNION and UNION ALL with two table variables. UNION removes the duplicate rows, while UNION ALL keeps every row from both tables.
SQL SERVER – Get Numeric Value From Alpha Numeric String – UDF for Get Numeric Numbers Only
A simple UDF that gets only the numbers from an alpha numeric string, using PATINDEX and STUFF, with test values for empty, NULL and mixed strings.
JSON_QUERY or JSON_VALUE: Match the JSON Shape
JSON_QUERY or JSON_VALUE depends on the JSON shape you need. One read-only document exposes scalar, object, array, JSON null and missing-path results side by side.
SQLAuthority News – SQL Injection – SQL Joke, SQL Humor, SQL Laugh
The SQL Injection cartoon readers sent me many times, finally on the blog. Plus a demo of how dynamic SQL opens the door to it, and a way to close it.
OLE DB or ODBC for Connecting to SQL Server
Choose OLE DB or ODBC for SQL Server by the component you run, especially SSIS, linked servers, and applications using current drivers.
SQL Server slow? Let's fix it together in about four hours.
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Who We Are
Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 24 years of hands-on experience. He holds a Masters of Science degree and numerous database certifications.
Pinal has authored 19 books and 125 Pluralsight courses. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,800 database tech articles on his blog at https://blog.sqlauthority.com.
Pinal is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2).
Nupur Dave is a social media enthusiast and an independent consultant. She primarily focuses on the database domain, helping clients build short and long-term multi-channel campaigns to drive leads for their sales pipeline.
Shaivi Pinalkumar Dave is a book author and a women’s artistic gymnast.

