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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;
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 ...
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 » Examples in Each Chapter
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.
Even if SQL is a standard, many of the database systems that exist today implement their own version of the SQL language. In this document, we will use the Microsoft SQL Server as an example. There are lots of different database systems, or DBMS – Database Management Systems, such as: • Microsoft SQL Server o Enterprise, Developer versions ...
Here’s an example query:- SELECT * FROM users; user’s table. It would then return data like the below, which is typically called. If we were to replace the asterisk wildcard character (*) with specific column names instead, only the data from these columns would be returned from the query. SELECT first_name, last_name FROM users;
Examples of data types are variable characters, date, integer, etc. INSERT INTO table_name VALUES (‘Cape Town’,’Western Cape’); INSERT INTO table_name VALUES (‘Hermanus’,’Western Cape’); INSERT INTO table_name VALUES (‘Queenstown’,’Eastern Cape’ ); Add new rows to the table with values as specified.