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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!
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now » Examples in Each Chapter
Learning SQL eBook (PDF) Download this eBook for free. Chapters. Chapter 1: Getting started with SQL. Chapter 2: ALTER TABLE. Chapter 3: AND & OR Operators. Chapter 4: Cascading Delete. Chapter 5: CASE. Chapter 6: Clean Code in SQL.
PdfGen.sql. PdfGen extends and enhances (replaces) the as_pdf3.cursor2table functionality with respect to column headers and widths, plus the ability to capture a column "page break" value for the page_procs callbacks, and go to a new page when the break-column value changes.
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.
SQL Window Functions Cheat Sheet. WINDOW FUNCTIONS. Window functions compute their result based on a sliding window frame, a set of rows that are somehow related to the current row. AGGREGATE FUNCTIONS VS. WINDOW FUNCTIONS. Unlike aggregate functions, window functions do not collapse rows. current row. SYNTAX. SELECT city, month, SUM(sold) OVER (
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.
