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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!
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.
SQL for beginners. Introduction. SQL is a language to query data. In most cases it is used to retrieve data from databases. Because SQL is so convenient, it may be used to query data that lives outside of databases (for example, you can use it with plain files). In day-to-day work of Data Engineers it plays a very important role.
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.
a database using SQL queries. In this chapter, we are going to learn more SQL commands which are required to perform various queries in a database. We will understand how to use single row functions, multiple row functions, arranging records in ascending or descending order, grouping records based on some criteria,
This book starts with a theoretical background to T-SQL querying and programming in Chapter 1, laying the foundations for the rest of the book, and basic coverage of creating tables and defining data integrity.
Mathematical Functions Performs a calculation based on input values provided as parameters to the function, and returns a numeric value. Metadata Functions Returns information about the database and database objects. Rowset Functions Returns an object that can be used in an SQL statement like a table.
