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join first_name and last_name to a single full_name column; apply math transformations, for example apply exchange rate for prices or calculate tax based on gross values; extract year from a date column; That's why in SQL exist column functions.
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.
1 maj 2023 · 7 Free SQL Books for Beginners to Master. Here is my list of some of the best books to learn SQL, which is absolutely free.
SQL, or Structured Query Language, is the primary language used to communicate with relational databases. The goal of this book is to serve as a useful introductory guide to this
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 ...
Learning MySQL eBook (PDF) Download this eBook for free. Chapters. Chapter 1: Getting started with MySQL. Chapter 2: ALTER TABLE. Chapter 3: Arithmetic. Chapter 4: Backticks. Chapter 5: Backup using mysqldump. Chapter 6: Change Password. Chapter 7: Character Sets and Collations. Chapter 8: Clustering. Chapter 9: Comment Mysql.
* Powerful, database-specific features such as SQL Server's PIVOT and UNPIVOT operators, Oracle's MODEL clause, and PostgreSQL's very useful GENERATE_SERIES function * Pivoting rows into columns, reverse-pivoting columns into rows, using pivoting to facilitate inter-row calculations, and double-pivoting a result set
