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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!
1 cze 2021 · Check the documentation for your specific database. LIKE OPERATOR – PATTERN MATCHING. Use the _ character to replace any single character. Use the % character to replace any number of characters (including 0 characters). Fetch all names that start with any letter followed by. 'atherine': SELECT name. FROM names. WHERE name LIKE '_atherine';
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 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 ...
Download. 01 - SQL - Oracle SQL Training Manual.pdf. 01 - SQL - Oracle SQL Training Manual.pdf.
This 3-page SQL Cheat Sheet provides you with the most commonly used SQL statements. Download the SQL cheat sheet, print it out, and stick to your desk.
2.5 Aggregate Functions To aggregate means to combine multiple elements into a whole. Similarly, aggregation functions take multiple rows of data and combine them into one number. 2.5.1 The COUNT Function COUNT(<column>) returns the number of non-null rows in the column. 1 SELECTCOUNT(first_name)FROMexecutions 9
