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SUBSTRING Binary: Count Bytes Rather Than Characters

June 30, 2010
Pinal Dave
SQL Tips and Tricks
SQL Datatype, SQL Function, SQL Server

SUBSTRING binary offsets use byte units. Keep text slicing separate from encoded payload slicing and retain empty and missing cases.

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SQL SERVER - Outer Join Not Allowed in Indexed Views

SQL SERVER – Outer Join Not Allowed in Indexed Views

June 29, 2010
Pinal Dave
SQL Performance
SQL Index, SQL Joins, SQL Scripts, SQL Statistics

Why is OUTER JOIN not allowed in indexed views? A reader was confused by the white paper answer, so I explain it with an example and ask for yours.

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SQLAuthority News - Exam 70-433 - MCTS - Microsoft SQL Server 2008, Database Development

SQLAuthority News – Exam 70-433 – MCTS – Microsoft SQL Server 2008, Database Development

June 29, 2010
Pinal Dave
SQL Tips and Tricks
Best Practices, Microsoft Certifications, MVP

I finally used my expiring Prometric voucher to take Exam 70-433, MCTS: SQL Server 2008 Database Development. Here is how it went at the test center.

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SQL SERVER - Default Statistics on Column - Automatic Statistics on Column

SQL SERVER – Default Statistics on Column – Automatic Statistics on Column

June 28, 2010
Pinal Dave
SQL Tips and Tricks
SQL Joins, SQL Scripts, SQL Server

Does a column need an index to have statistics? No. A quick demo shows automatic statistics on column data when AUTO_CREATE_STATISTICS is on.

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Two trays pair a blue bowl with a cream jug and a blue jug with a cream bowl.

Count Distinct Pairs: Keep the Columns Together

June 27, 2010
Pinal Dave
SQL Tips and Tricks
Developer, SQL Distinct, SQL NULL, SQL Server, SQL Sub Query

Count distinct pairs by keeping their columns together. A small T-SQL example shows why concatenated labels can collide. Choose whether incomplete pairs belong in the count.

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Gouache painting: beside a river, a thin reed clump and a dense tall one both lean left with the current

SIGN: Classify Positive, Negative and Zero Values

June 26, 2010
Pinal Dave
SQL Tips and Tricks
Mathematical Function, SQL Function, SQL Server

SIGN describes which side of zero an amount occupies. Preserve the original quantity and distinguish a zero value from missing input.

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A compact first-aid tin stands open with neatly arranged plain bandage rolls on a shelf.

A Monthly Health Check You Can Run in Ten Minutes

June 25, 2010
Pinal Dave
SQL Performance
Best Practices, Database, SQL Scripts, SQL Server

Run a SQL Server health check that reviews backups, integrity-check evidence, file growth, users, build level, and space without guessing health.

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