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SQL Handwritten Notes Repository: A collection of PDF notes covering SQL concepts with concise definitions and examples. Explore fundamental commands, date/time functions, joins, and more. Contributions welcome! Happy studying and coding!
10 sty 2012 · It has to do with the Normal Form for the SQL language. IF statements can, by definition, only take a single SQL statement. However, there is a special kind of SQL statement which can contain multiple SQL statements, the BEGIN-END block.
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User-defined functions (UDFs) allow you to extend SQL by creating custom functions. UDFs encapsulate specific logic and can be used within SQL statements just like built-in functions. They provide a way to modularize complex calculations or data transformations, improving code readability and reusability.
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1 cze 2021 · Standard SQL Functions Cheat Sheet. TEXT FUNCTIONS. CONCATENATION. Use the || operator to concatenate two strings: SELECT 'Hi ' || 'there!'; -- result: Hi there! Remember that you can concatenate only character strings using ||. Use this trick for numbers: SELECT '' || 4 || 2; -- result: 42.
You can down‐load it at http://sqlitestudio.pl/?act=download. Be sure to choose Windows, Mac, or Linux for your respective OS. Then open the downloaded folder and copy it to a loca‐tion of your choice. No installation is needed. To start SQLiteStudio, double-click SQLiteStudio.exe (Figure 3-1).
