Download MySQL Phrasebook: Essential Code and Commands by Zak Greant, Chris Newman PDF

By Zak Greant, Chris Newman

The MySQL Phrasebook is a pocket consultant that's choked with beneficial and crucial code "phrases" for the MySQL developer's daily use. choked with useful strategies for projects that the MySQL developer needs to accomplish on a daily basis, it fills the necessity for a brief, practical, to-the-point reference for MySQL. this can be the advisor to refer to for those who want a right away, appropriate method to common initiatives and code that's versatile and adaptable for your wishes. some time will not be wasted on extra tutorials it easily places crucial "phrases" at your fingertips for you to take with you in every single place.

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Additional info for MySQL Phrasebook: Essential Code and Commands

Example text

For example, to grab rows 12 through 15 of a query, you would say SELECT * FROM some_table LIMIT 11, 4;. " Sorting Result Sets # Get a list of alphabetically sorted book names SELECT title FROM book ORDER BY title; 33 34 # Sort alphabetically but with an exception SELECT name FROM status ORDER BY name='default' DESC, name; When you fetch rows from MySQL, they are returned to you in a haphazard order that might or might not fit your needs. Thankfully, MySQL allows you to specify in which order the rows should be returned.

The order is specified using the ORDER BY clause. The clause accepts a list of one or more expressions (which can just be column names). For every row, the expressions in the ORDER BY clause are evaluated. Then the resulting values are put into a list that is then sorted. The rows are then returned according to this order. Sound complex? Here is a simplified version of the steps laid out for you: 1. A query is sent to the server, like so: SELECT * FROM book ORDER BY title; 2. For every row that is returned, the appropriate value of the title column is put into a list, like the following: Green Eggs and Ham (Row 1) In the Night Kitchen (Row 2) How to Be a Grouch (Row 3) Jacob Two-Two Meets the Hooded Fang (Row 4) Additionally, the server knows to which row the title corresponds.

MIN() and MAX(), respectively, return the minimum and maximum values stored in a given column, while AVG() returns the average of all values in the column as a floating point number. Interestingly, MIN() and MAX() work with columns that contain text. MIN() returns the value that would come first alphabetically, while MAX() returns the value that would come last alphabetically. html 36 37 Date and Time Manipulation # Find dates newer than one week ago SELECT users FROM accounts WHERE created >= DATE_SUB(CURDATE(), INTERVAL 1 WEEK); Basic manipulations and comparisons of dates and times within MySQL are quite simple.

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