SQL LANGUAGE TUTORIAL

Prof: Dr. Shu-Ching ChenTA: Hsin-Yu Ha

Basic Syntax of SQL Language

SELECT attribute name(s)FROM table nameWHERE comparison predicate (Boolean expression)GROUP BY attribute nameHAVING comparison predicate ORDER BY attribute name

Create Tables

SELECT ALL records

• Formula • Like & DISTINCT

SELECT specific records with conditions

SQL ORDER BY

SQL UPDATEUPDATE table nameSET column1 = value, column2 = value2,…WHERE comparison predicate (Boolean expression)

AVG() - Returns the average valueCOUNT() - Returns the number of rowsFIRST() - Returns the first valueLAST() - Returns the last valueMAX() - Returns the largest valueMIN() - Returns the smallest valueSUM() - Returns the sum

SQL IN OPERATOR

SQL Alias

SQL Joins

INNER JOIN: Return rows when there is at least one match in both tables

LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table

RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table

SELECT column_name(s)FROM table_name1 JOIN_TYPES table_name2ON table_name1.column_name = table_name2.column_name

SQL INNER JOIN

SQL LEFT JOIN

SQL RIGHT JOIN

SQL GROUP BY Statement

SQL HAVING Clause

PosgreSQL Arrays (1)

PosgreSQL Arrays (2)

PosgreSQL Arrays (3)

PosgreSQL Composite Types