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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.
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 ...
2 wrz 2024 · In this guide, we will see a comprehensive cheat sheet for essential SQL operations, offering a practical reference for tasks ranging from database creation to advanced data handling techniques.
It starts from the absolute basics (SELECT * FROM table_name;) and guides you to the intermediate level (JOIN, HAVING, subqueries). I added everything that you will need as a data analyst/ scientist. The ideal use case of this cheat sheet is that you print it in color and keep it next to you while you are learning and practicing SQL on your ...
22 paź 2024 · SQL Practice Exercises for Beginners. Basic Retrieval. Filtering. Arithmetic Operations and Comparisons: Formatting. Aggregation Functions. SQL Practice Exercises for Intermediate. Group By and Having. Joins. Window Functions. Conditional Statements. DateTime Operations. SQL Practice Exercises for Advanced. Creating and Aliasing. Subqueries.
25 cze 2024 · This SQL cheat sheet provides you with the necessary concepts required to start on with SQL. It is helpful for beginners willing to learn and work on SQL. SQL BASICS. SQL: Structured query language (SQL) is a domain specific language used for programming and querying a database. Datatypes for SQL:
This SQL cheat sheet—part of our Complete Guide to SQL —provides a quick reference for common SQL operations and functions, adapted to work with the Classic Models database.
