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Table 8-6 PostgreSQL Nonstandard String Functions
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Description Remove characters found in characterlist (the default is a space) from the end (right side) of string Split string based on delimiter character and return the resulting int field Return the location of substring in string (note this is the reverse order of the position() function) Return the substring of count characters starting at location within string Return the ASCII representation of string using encoding (the default is the normal string encoding) Convert int value into a hexadecimal value Replace every occurrence of fromstring within string with tostring
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split_part(string, delimiter, int) strpos(string, substring)
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Table 8-6 PostgreSQL Nonstandard String Functions (continued)
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The PostgreSQL date and time functions allow you to use date and time values in your applications These functions all manipulate data using the date data type Table 8-7 lists and describes the date and time functions supported by PostgreSQL The most important part of the date and time functions is to become comfortable with the way PostgreSQL deals with dates and times The format used depends on the datestyle parameter setting in the postgresqlconf configuration file (see 3) By default, PostgreSQL uses the date and time style appropriate for your locale setting Here is an easy way to see how dates and times will look in your setting:
test=> select current_date, current_time, current_timestamp; date | timetz | now + + 2006-08-15 | 19:51:31837-04 | 2006-08-15 19:51:31837-04 (1 row) test=>
PostgreSQL 8 for Windows
Date/Time Function age(timestamp) age(timestamp1, timestamp2) current_date current_time current_timestamp date_part(field, timestamp) date_part(field, interval) date_trunc(precision, timestamp) extract(field from timestamp) extract(field from interval) isfinite(timestamp) isfinite(interval) justify_hours(interval) justify_days(interval) localtime localtimestamp now() timeofday()
Description Return the time between the current date and time and timestamp Return the time between timestamp1 and timestamp2 Return the current date Return the current time Return the current date and time Return the subfield field from timestamp Return the subfield field from a time interval Return a truncated value of timestamp, rounded to the nearest precision Return the subfield field from timestamp Return the subfield field from a time interval Return TRUE if timestamp is infinity Return TRUE if time interval is infinity Adjust time interval to convert 24-hour values to days Adjust time interval to convert 30-day values to months Return the current time of day Return the current date and time Return the current date and time Return the current date and time
Table 8-7 PostgreSQL Date and Time Functions
Besides these functions, there is also the now() and timeofday() functions:
test=> select now(), timeofday(); now | timeofday + 2006-08-15 13:56:01776-04 | Tue Aug 15 13:56:01807000 2006 EDT (1 row) test=>
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PostgreSQL Functions
The date_part() and extract() functions allow you to extract individual date or time values from larger timestamp values This is handy when trying to combine or compare items by date, such as looking for all items purchased in September These functions use common words such as year, day, month, hour, minute, second, and millisecond, to extract the desired value:
test=> select date_part('month', current_timestamp); date_part 8 (1 row) test=>
MATH FUNCTIONS
It is not surprising that PostgreSQL includes lots of math functions There are math functions for just about every common math utility you could require in your application Table 8-8 lists and describes the various math functions supported by PostgreSQL All of the math functions return numeric values If you need to use a math function within a WHERE clause, remember to place it in an expression that evaluates to TRUE or FALSE The random() function is often used to produce random numbers for applications The random() function only returns a random number between 0 and 1 It is your job to extrapolate that value to the range you require for your application If you need to produce a random integer value between 10 and 50, you would use
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