Download Database design manual : using MySQL for Windows by Matthew Norman PDF

By Matthew Norman

Essential SQL fast offers a finished consultant to SQL, utilizing the Windows-based model of MySQL. MySQL is a freely to be had, multi-platform database administration approach, making it perfect for studying the ideas and ideas of database layout. utilizing a variety of labored examples and illustrations, Matthew Norman describes tips on how to manage the database administration process MySQL. In doing so he covers quite a few issues, together with: fitting and checking out MySQL; utilizing the graphical instruments; database layout strategies and ideas; retrieving, altering and deleting facts; and the way to make different items converse with MySQL.

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Every column has data in it that is repeated. php page is repeated in this column four times. Now look at the browser column. Not only is the Mozilla entry repeated three times it is also storing a lot of text for each row. Although lots of data is repeated, it is not necessarily all redundant. Data is classed as redundant if it can be removed from a table without loss of information. 2. 2 has more obvious redundancies. You will notice that in the six rows shown, only three of these rows are unique.

Tablename is the table to insert the data into. The columns are the columns that you want to insert, in the order that they appear within your text file. org If we wanted to import that file into our log table, we would need to save the above as a text file. sql and save it in: C:\mysql\data\mysqlfast Chapter 5 • Populating the Database 53 By default, LOAD DATA expects the file to be on the same machine as the MySQL server, within the directory that contains the information about the current database, in our case, mysqlfast.

For example: columnname INT(10) Chapter 3 • How Shall We Store it? – Datatypes 21 will specify the number stored padded with up to 10 leading spaces. So if you were to store the number 42 in an INT(10) datatype, the following would be returned: ••••••••42 Each • in the above represents a space. This is useful when you are outputting your numbers in columns, as it will make all of the column line up neatly (unless the number is bigger in this case than 999 999 999). A similar keyword, ZEROFILL when appended to the end of the integer declaration will make the returned number be padded out with zeros instead of spaces, so this time, the type declaration: columnname INT(10) ZEROFILL will produce the following when 42 is retrieved from it: 0000000042 These two variations of the datatype do not actually alter the number that is stored within the table; it just changes the formatting of the number when it is retrieved.

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