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In different databases, the syntax of selecting top N records are slightly different. They may also differ from ISO standards.
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This code snippet shows how to convert string to date.
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This code snippet shows how to calculate time differences.
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JSON is commonly used in modern applications for data storage and transfers. Pretty much all programming languages provide APIs to parse JSON.
Select from dual in T-SQL / SQL Server
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In Oracle database, you can select from dual table if you only want to return a one row result set. In many other databases, the query engine supports select directly from constant values without specifying a table name.
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Tutorial –1 For Teradata developers, if you have no SQL Server installed, please go to the following link to download the SQL Server 2014 Expression Edition. ...
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SELECT is one of the most commonly used statements. In this tutorial, I will cover the following items: Two of the principal query clauses—FROM and SELECT Data Types Built-in functions CASE expressions and variations like ISNULL and COALESCE. * The functio...
