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manual.texi added explicit entry for EXTRACT() function

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Docs/manual.texi:
  added explicit entry for EXTRACT() function
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unknown 2001-08-06 11:55:44 -05:00
parent c67510f093
commit a8c230adeb
1 changed files with 18 additions and 8 deletions
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Docs/manual.texi
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@ -30531,7 +30531,7 @@ mysql> select PERIOD_DIFF(9802,199703);
@findex DATE_SUB()
@findex ADDDATE()
@findex SUBDATE()
@findex EXTRACT(type FROM date)
@findex EXTRACT()
@item DATE_ADD(date,INTERVAL expr type)
@itemx DATE_SUB(date,INTERVAL expr type)
@itemx ADDDATE(date,INTERVAL expr type)
@ -30551,7 +30551,7 @@ or subtracted from the starting date. @code{expr} is a string; it may start
with a @samp{-} for negative intervals. @code{type} is a keyword indicating
how the expression should be interpreted.
The @code{EXTRACT(type FROM date)} function returns the 'type'
The related function @code{EXTRACT(type FROM date)} returns the 'type'
interval from the date.
The following table shows how the @code{type} and @code{expr} arguments
@ -30605,12 +30605,6 @@ mysql> SELECT DATE_ADD("1998-01-01 00:00:00",
-> 1997-12-30 14:00:00
mysql> SELECT DATE_SUB("1998-01-02", INTERVAL 31 DAY);
-> 1997-12-02
mysql> SELECT EXTRACT(YEAR FROM "1999-07-02");
-> 1999
mysql> SELECT EXTRACT(YEAR_MONTH FROM "1999-07-02 01:02:03");
-> 199907
mysql> SELECT EXTRACT(DAY_MINUTE FROM "1999-07-02 01:02:03");
-> 20102
@end example
If you specify an interval value that is too short (does not include all the
@ -30649,6 +30643,22 @@ mysql> select DATE_ADD('1998-01-30', Interval 1 month);
Note from the preceding example that the word @code{INTERVAL} and the
@code{type} keyword are not case sensitive.
@findex EXTRACT()
@item EXTRACT(type FROM date)
The @code{EXTRACT()} function uses the same kinds of interval type
specifiers as @code{DATE_ADD()} or @code{DATE_SUB()}, but extracts parts
from the date rather than performing date arithmetic.
@example
mysql> SELECT EXTRACT(YEAR FROM "1999-07-02");
-> 1999
mysql> SELECT EXTRACT(YEAR_MONTH FROM "1999-07-02 01:02:03");
-> 199907
mysql> SELECT EXTRACT(DAY_MINUTE FROM "1999-07-02 01:02:03");
-> 20102
@end example
@findex TO_DAYS()
@item TO_DAYS(date)
Given a date @code{date}, returns a daynumber (the number of days since year