Get Sams Teach Yourself MySQL in 10 Minutes PDF

By Chris Newman

ISBN-10: 0672328631

ISBN-13: 9780672328633

ISBN-10: 0768666287

ISBN-13: 9780768666281

Sams educate your self MySQL in 10 mins offers a no-fluff, just-the-answers consultant to development and dealing with MySQL databases. it truly is conscientiously equipped and thoughtfully written to supply simply the data that you just desire which will achieve a quick operating wisdom of MySQL. wake up to hurry fast with Sams educate your self MySQL in 10 mins.

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00 sec) The CEILING and FLOOR functions round a decimal number up and down to the nearest integer, respectively. 00 sec) Rounding Negatives Rounding a negative number up produces a higherthat is, less negativevalue. Rounding down produces a lower value. 6. The TRUNCATE function takes two arguments, a number and a precision. It does not round the number, but simply removes from it decimal places in excess of the precision specified. 00 sec) Mathematical Functions This set of functions enables you to perform mathematical operations in a query.

The / operator in MySQL returns a decimal numberit does not truncate the result or round it to the nearest whole number. 00 sec) Precedence The *, /, DIV, and MOD operators have a higher precedence than + and -. You can use parentheses where necessary to alter the order in which an expression is evaluated. Part 2: Getting Started with SQL 47 48 Part 2: Getting Started with SQL The DIV operator can be used to perform division where only a whole number is returned and any remainder is simply discarded.

Using Quotes Around Values You might have noticed in the previous examples that sometimes the values used in a WHERE clause were contained in single quotes. This is necessary when the value being compared is a non-numeric value because 34 Part 2: Getting Started with SQL Part 2: Getting Started with SQL 35 MySQL needs to know whether you are referring to a fixed value or a column name from a table in the query. Consider the following query, which produces the error shown: mysql> SELECT last_name -> FROM customer_contacts -> WHERE first_name = Benjamin; ERROR 1054 (42S22): Unknown column 'Benjamin' in 'where clause' The error message indicates that MySQL is trying to find a column named Benjamin in the customer_contacts tableof course, this does not exist.

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Sams Teach Yourself MySQL in 10 Minutes by Chris Newman


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