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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 ...
1 cze 2021 · Use the || operator to concatenate two strings: SELECT 'Hi ' || 'there!'; -- result: Hi there! ||. Use this trick for numbers: Some databases implement non-standard solutions for concatenating strings like CONCAT() or CONCAT_WS(). Check the documentation for your specific database. Use the _ character to replace any single character.
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
This document summarizes built-in SQL functions in Oracle. It covers character functions that return character and numeric values, numeric functions, date functions, conversion functions, group functions, and other miscellaneous functions.
1 Introduction to SQL SQL (Structured Query Language) is a database computer language designed for managing data in relational database management systems (RDBMS). SQL, is a standardized computer language that was originally developed by IBM for querying, altering and defining relational databases, using declarative statements.
Familiarity with data processing concepts and techniques. Display data from multiple tables using the ANSI SQL 99 JOIN 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.
• Explain and apply the use of YY and RR to return the correct year as stored in the database. Identify the vocabulary word for each definition below. dashes, and special characters. Functions that convert a value from one datatype to another. Used to store variable-length numeric data. characters, and dashes. Used for date and time values.
