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1c5aec60bb
TO_DATE()
and PgSQL extension FROM_CHAR().
TO_CHAR() routine allow formating text output with a datetime values:
SELECT TO_CHAR('now'::datetime, '"Now is: "HH24:MI:SS');
to_char
----------------
Now is: 21:04:10
FROM_CHAR() routine allow convert text to a datetime:
SELECT FROM_CHAR('September 1999 10:20:30', 'FMMonth YYYY
HH:MI:SS');
from_char
-----------------------------
Wed Sep 01 10:20:30 1999 CEST
TO_DATE() is equal with FROM_CHAR(), but output a Date only:
SELECT TO_DATE('September 1999 10:20:30', 'FMMonth YYYY
HH:MI:SS');
to_date
----------
09-01-1999
In attache is compressed dir for the contrib. All is prepared, but I'am
not
sure if Makefile is good (probably yes).
Comments & suggestions ?
Thomas, thank you for your good advices.
Karel
------------------------------------------------------------------------------
Karel Zak <zakkr@zf.jcu.cz>
http://home.zf.jcu.cz/~zakkr/
59 lines
1.4 KiB
SQL
59 lines
1.4 KiB
SQL
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---
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--- Postgres DateStyle needs all tests which parsing 'now'::datetime string
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---
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SET DATESTYLE TO 'Postgres';
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SELECT 'now'::datetime =
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TO_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY')::datetime
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as "Now vs. to_char";
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SELECT 'now'::datetime =
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FROM_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY')
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as "Now vs. from_char";
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SELECT FROM_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY') =
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TO_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY')::datetime
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as "From_char vs. To_char";
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SELECT 'now'::datetime =
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FROM_CHAR(
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TO_CHAR('now'::datetime, '"Time: "HH24-MI-SS" Date: "Dy DD Mon YYYY'),
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'"Time: "HH24-MI-SS" Date: "Dy DD Mon YYYY'
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)
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as "High from/to char test";
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SELECT TO_CHAR('now'::datetime, 'SSSS')::int =
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TO_CHAR('now'::datetime, 'HH24')::int * 3600 +
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TO_CHAR('now'::datetime, 'MI')::int * 60 +
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TO_CHAR('now'::datetime, 'SS')::int
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as "SSSS test";
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SELECT TO_CHAR('now'::datetime, 'WW')::int =
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(TO_CHAR('now'::datetime, 'DDD')::int -
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TO_CHAR('now'::datetime, 'D')::int + 7) / 7
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as "Week test";
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SELECT TO_CHAR('now'::datetime, 'Q')::int =
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TO_CHAR('now'::datetime, 'MM')::int / 3 + 1
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as "Quartal test";
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SELECT TO_CHAR('now'::datetime, 'DDD')::int =
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(TO_CHAR('now'::datetime, 'WW')::int * 7) -
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(7 - TO_CHAR('now'::datetime, 'D')::int) +
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(7 - TO_CHAR(('01-Jan-'||
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TO_CHAR('now'::datetime,'YYYY'))::datetime,'D')::int)
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+1
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as "Week and day test";
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