SQL For MySQL: A Beginner's Tutorial by Djoni Darmawikarta

By Djoni Darmawikarta

Written via a database specialist with twenty years advertisement adventure, this handbook is an approachable and uncomplicated advent to the SQL variation for MySQL. SQL, which stands for based question Language is the normal language you utilize to have interaction with a relational database administration process (RDBMS). This publication makes use of the unfastened variation of the MySQL database to teach how SQL works. It teaches rookies tips to pick out info from the database, insert and replace info, and the way to create database items with chapters that element every one subject with jargon-free language.

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Extra resources for SQL For MySQL: A Beginner's Tutorial

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FROM table; An alias can consist of one or multiple words. g. “PRODUCT NAME”. 1 uses an alias for the p_name column. 1, you will see the output rows like this. 34 SQL for MySQL: A Beginner's Tutorial +--------+--------------+ | p_code | PRODUCT NAME | +--------+--------------+ | 1 | Nail | | 2 | Washer | | 3 | Nut | | 4 | Screw | | 5 | Super_Nut | | 6 | New Nut | +--------+--------------+ Expressions An output column can also be an expression. An expression in the SELECT clause can include columns, literal values, arithmetic or string operators, and functions.

To make sure you refer to the correct column of a table, you need to qualify it with its table. c_no (the c_no column of the customer table) were how the c_no columns were qualified. A table alias can be a more convenient (and shorter) way to qualify a column. For example, in the query in Listing 6. 2, o is an alias for the c_order table and c is an alias for the customer table. These aliases are then used in the ON clause to qualify the c_no columns with their respective tables. c_no; Column Aliases vs.

In other words, the HAVING condition is on the aggregate, not on a column. If present, the HAVING clause must appear after the GROUP BY clause, as in the following syntax. 3 uses a HAVING condition. 3: Using the HAVING condition SELECT launch_dt, MAX(price) MAX , 51 52 SQL for MySQL: A Beginner's Tutorial MIN(price) MIN , SUM(price) SUM , AVG(price) AVG , COUNT(price) CNT , COUNT(*) AS 'C(*)' FROM product GROUP BY price, launch_dt HAVING COUNT(price) > 1 ORDER BY price, launch_dt; Only groups having more than one row (satisfying the COUNT(price) > 1 condition) will be returned.

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