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Gouache painting: three clarinet cases on a wooden table, one holding a single clarinet, one with two clarinets crammed in, and a larger case lined in deep red

WITHOUT_ARRAY_WRAPPER: Keep JSON Cardinality Explicit

December 1, 2010
Pinal Dave
SQL Tips and Tricks
SQL Datatype, SQL Function, SQL Scripts

WITHOUT_ARRAY_WRAPPER needs a single-row JSON contract. Compare one object with two unwrapped objects and validate the complete generated text.

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Finding the One Row That Broke Your Data Load

November 30, 2010
Pinal Dave
SQL Tips and Tricks
Best Practices, Data Warehousing, Database, ETL

Trace a data load error to its source row with raw staging, TRY_CONVERT, stable row identifiers, and a rejection report that supports a safe retry.

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SQL SERVER - DBA or DBD? - Database Administrator or Database Developer

SQL SERVER – DBA or DBD? – Database Administrator or Database Developer

November 29, 2010
Pinal Dave
SQL Tips and Tricks
Database, DBA

My poll asked if you are a Database Administrator or Database Developer. Of 694 voters, 63.4% chose developer, so maybe DBD earns a dictionary spot.

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SQL SERVER - Concat Function in SQL Server - SQL Concatenation

SQL SERVER – Concat Function in SQL Server – SQL Concatenation

November 25, 2010
Pinal Dave
SQL Tips and Tricks
SQL Scripts, SQL String

Is there a CONCAT function in SQL Server? An attendee said MySQL and Oracle have one. I show how the plus operator joins strings, numbers and column values.

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geometry STIsEmpty: Empty Shapes Are Different From SQL NULL

November 24, 2010
Pinal Dave
SQL Tips and Tricks
Spatial Database, SQL Function, SQL Scripts, SQL Server

geometry STIsEmpty tests whether an existing spatial instance has an empty point set. I keep that condition separate from SQL NULL. A missing database value and a present empty geometry are different inputs.

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Database Properties - Perftest.

SQL SERVER – Change Database Access to Single User Mode Using SSMS

November 21, 2010
Pinal Dave
SQL Tips and Tricks
SQL Server Management Studio

I showed before how to set single user mode with T-SQL before a backup. You can also set single user mode using SSMS, from the database properties page.

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How to Practise SQL Without a Real Database

November 20, 2010
Pinal Dave
SQL Tips and Tricks
Best Practices, Database, SQL Scripts, SQL Server

You can practise SQL with small invented tables, generated rows, and repeatable exercises without access to a company's production database.

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