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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!
USEFUL FUNCTIONS. Get the count of characters in a string: SELECT LENGTH('LearnSQL.com'); -- result: 12. Convert all letters to lowercase: SELECT LOWER('LEARNSQL.COM'); -- result: learnsql.com. Convert all letters to uppercase: SELECT UPPER('LearnSQL.com'); -- result: LEARNSQL.COM.
SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now ».
10 sty 2012 · The BEGIN ... END construct is separate from the IF. It binds multiple statements together as a block that can be treated as if they were a single statement. Hence BEGIN ... END can be used directly after an IF and thus the whole block of code in the BEGIN .... END sequence will be either executed or skipped.
12 wrz 2022 · Learn how to build conditional logic when writing SQL code using IF, BEGIN, END, ELSE, and ELSEIF logic.
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.
Whether you need a quick reference for major SQL concepts before an interview, or you want to level-up your existing SQL skills, our SQL cheat sheet is the ideal starting point. Plus, we’ve broken it down into 11 essential SQL topics to help you get the most from this SQL query cheat sheet.
