Test splitting OR conditions into disjoint UNION ALL branches, preserve NULL behavior and row identity, and compare actual index access.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
Recovering One Dropped Table From a Full Backup
Recover one dropped table through a separate restored database, choose the recovery point, copy its data, and rebuild the table rules.
Data Compression for Performance – SQL in Sixty Seconds #188
Earlier I wrote a blog post about how Data Compression for Performance can help improve the efficiency of SQL Server.
Estimate Compression Savings for Every Table in a Database
To estimate compression savings for every table, loop over the database and call sp_estimate_data_compression_savings with ROW and PAGE. This post ranks tables by space saved and checks one estimate against a real rebuild.
ZIP Codes Stored as int: Lost Zeros and How to Repair Them
An int column turns 01234 into 1234 and never gives the zero back. Here is how to fix the column, and how to repair old rows without guessing.
tempdb-Heavy Queries: Finding Them in Query Store
The tempdb spike is over before you log in. Query Store remembers who caused it, and here is how to ask.
Scalar Subqueries: An Empty Input Produces NULL
Scalar subqueries contribute one value to an outer row. Keep row absence separate from a present NULL and enforce the at-most-one-row contract.
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