Finding the Day of the Week for a Date

5.25.1 Problem

You want to know the day of the week a date falls on.

5.25.2 Solution

Use the DAYNAME( ) function.

5.25.3 Discussion

To determine the name of the day of the week for a given date, use DAYNAME( ):

mysql> SELECT CURDATE( ), DAYNAME(CURDATE( ));
+------------+--------------------+
| CURDATE( ) | DAYNAME(CURDATE( )) |
+------------+--------------------+
| 2002-07-15 | Monday |
+------------+--------------------+

DAYNAME( ) is often useful in conjunction with other date-related techniques. For example, to find out the day of the week for the first of the month, use the first-of-month expression from earlier in the chapter as the argument to DAYNAME( ):

mysql> SET @d = CURDATE( );
mysql> SET @first = DATE_SUB(@d,INTERVAL DAYOFMONTH(@d)-1 DAY);
mysql> SELECT @d AS 'starting date',
 -> @first AS '1st of month date',
 -> DAYNAME(@first) AS '1st of month day';
+---------------+-------------------+------------------+
| starting date | 1st of month date | 1st of month day |
+---------------+-------------------+------------------+
| 2002-07-15 | 2002-07-01 | Monday |
+---------------+-------------------+------------------+

Using the mysql Client Program

Writing MySQL-Based Programs

Record Selection Techniques

Working with Strings

Working with Dates and Times

Sorting Query Results

Generating Summaries

Modifying Tables with ALTER TABLE

Obtaining and Using Metadata

Importing and Exporting Data

Generating and Using Sequences

Using Multiple Tables

Statistical Techniques

Handling Duplicates

Performing Transactions

Introduction to MySQL on the Web

Incorporating Query Resultsinto Web Pages

Processing Web Input with MySQL

Using MySQL-Based Web Session Management

Appendix A. Obtaining MySQL Software

Appendix B. JSP and Tomcat Primer

Appendix C. References



MySQL Cookbook
MySQL Cookbook
ISBN: 059652708X
EAN: 2147483647
Year: 2005
Pages: 412
Authors: Paul DuBois

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