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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 ...
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!
1 cze 2021 · SELECT INITCAP('edgar frank ted cODD'); -- result: Edgar Frank Ted Codd. Get just a part of a string: SELECT SUBSTRING('LearnSQL.com', 9); -- result: .com. SELECT SUBSTRING('LearnSQL.com', 0, 6); -- result: Learn. Replace part of a string: SELECT REPLACE('LearnSQL.com', 'SQL', 'Python');
The SQL cheat sheet provides you with the most commonly used SQL statements for your reference. You can download the SQL cheat sheet as follows: Download 3-page SQL cheat sheet in PDF format. Querying data from a table. Query data in columns c1, c2 from a table. SELECT c1, c2 FROM t; Code language: SQL (Structured Query Language) (sql)
Formatting and manipulating the data. Aggregate functions. Group By. Where aggregate functions are used in conjunction with other fields, GROUP BY is used to group the data so that the aggregate still makes sense.
SQL statements are the means by which programs and users access data in an Oracle database. The sections that follow show each SQL statement and its related syntax.
Employ SQL functions to generate customized data. Create reports of aggregated data. Use the SET operators to create subsets of data. Run data manipulation statements (DML) in Oracle Database 11g. Run data definition language (DDL) statements to create schema objects. Identify the major structural components of Oracle Database 11g.
