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1 maj 2023 · That’s all in this list of Free SQL books for beginners and experienced developers. You can download these books as free PDF or read them online as well.
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.
The SQL Cookbook moves quickly from problem to solution, saving you time each step of the way.... Table of Contents. 1. Working with Ranges. 1.1. Locating a Range of Consecutive Values. 1.2. Finding Differences Between Rows in the Same Group or Partition. 1.3. Locating the Beginning and End of a Range of Consecutive Values. 1.4.
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;
1 cze 2021 · Fetch all names that start with any letter followed by 'atherine': SELECT name FROM names WHERE name LIKE '_atherine'; Fetch all names that end with 'a': SELECT name FROM names WHERE name LIKE '%a'; USEFUL FUNCTIONS. Get the count of characters in a string: SELECT LENGTH('LearnSQL.com');-- result: 12 Convert all letters to lowercase: SELECT ...
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.
