Thursday, July 10, 2014

Common PHP MySQL Queries for Beginners and Advanced learners

Common MySQL Queries

Aggregates
Join or subquery?
Primary keys
Show
NULLs
Ordering resultsets
Date and time
Pagination
Relational division
Sequences
Aggregates and Statistics
Period arithmetic
Aggregates from bands of values
Pivot tables (crosstabs)
Spherical geometry
Scheduling
Statistics without aggregates
Data comparison
Frequencies
Graphs and Hierarchies
Stored procedures
Database metadata
Strings
JOIN
Foreign keys

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Common PHP MySQL Queries for Beginners and Advanced learners




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12.7 Date and Time Functions

This section describes the functions that can be used to manipulate temporal values. See Section 11.3, “Date and Time Types”, for a description of the range of values each date and time type has and the valid formats in which values may be specified.
Table 12.13 Date/Time Functions
NameDescription
ADDDATE()Add time values (intervals) to a date value
ADDTIME()Add time
CONVERT_TZ()Convert from one timezone to another
CURDATE()Return the current date
CURRENT_DATE(), CURRENT_DATESynonyms for CURDATE()
CURRENT_TIME(), CURRENT_TIMESynonyms for CURTIME()
CURRENT_TIMESTAMP(), CURRENT_TIMESTAMPSynonyms for NOW()
CURTIME()Return the current time
DATE_ADD()Add time values (intervals) to a date value
DATE_FORMAT()Format date as specified
DATE_SUB()Subtract a time value (interval) from a date
DATE()Extract the date part of a date or datetime expression
DATEDIFF()Subtract two dates
DAY()Synonym for DAYOFMONTH()
DAYNAME()Return the name of the weekday
DAYOFMONTH()Return the day of the month (0-31)
DAYOFWEEK()Return the weekday index of the argument
DAYOFYEAR()Return the day of the year (1-366)
EXTRACT()Extract part of a date
FROM_DAYS()Convert a day number to a date
FROM_UNIXTIME()Format UNIX timestamp as a date
GET_FORMAT()Return a date format string
HOUR()Extract the hour
LAST_DAYReturn the last day of the month for the argument
LOCALTIME(), LOCALTIMESynonym for NOW()
LOCALTIMESTAMP, LOCALTIMESTAMP()Synonym for NOW()
MAKEDATE()Create a date from the year and day of year
MAKETIME()Create time from hour, minute, second
MICROSECOND()Return the microseconds from argument
MINUTE()Return the minute from the argument
MONTH()Return the month from the date passed
MONTHNAME()Return the name of the month
NOW()Return the current date and time
PERIOD_ADD()Add a period to a year-month
PERIOD_DIFF()Return the number of months between periods
QUARTER()Return the quarter from a date argument
SEC_TO_TIME()Converts seconds to 'HH:MM:SS' format
SECOND()Return the second (0-59)
STR_TO_DATE()Convert a string to a date
SUBDATE()Synonym for DATE_SUB() when invoked with three arguments
SUBTIME()Subtract times
SYSDATE()Return the time at which the function executes
TIME_FORMAT()Format as time
TIME_TO_SEC()Return the argument converted to seconds
TIME()Extract the time portion of the expression passed
TIMEDIFF()Subtract time
TIMESTAMP()With a single argument, this function returns the date or datetime expression; with two arguments, the sum of the arguments
TIMESTAMPADD()Add an interval to a datetime expression
TIMESTAMPDIFF()Subtract an interval from a datetime expression
TO_DAYS()Return the date argument converted to days
UNIX_TIMESTAMP()Return a UNIX timestamp
UTC_DATE()Return the current UTC date
UTC_TIME()Return the current UTC time
UTC_TIMESTAMP()Return the current UTC date and time
WEEK()Return the week number
WEEKDAY()Return the weekday index
WEEKOFYEAR()Return the calendar week of the date (0-53)
YEAR()Return the year
YEARWEEK()Return the year and week
 
 
 
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