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CREATE INDEX tabindex ON tab (lower(col));
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pg_dump ¤Ç -o¥ª¥×¥·¥ç¥ó¤ò»È¤¦¤«¡¢¤Þ¤¿¤Ï¡¢COPY WITH OIDS¥ª¥×¥·¥ç¥ó¤ò»È¤¦É¬Íפ¬¤¢
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- CREATE TABLE new (old_oid oid, mycol int);
- SELECT old_oid, mycol INTO new FROM old;
- COPY new TO '/tmp/pgtable';
- DELETE FROM new;
- COPY new WITH OIDS FROM '/tmp/pgtable';
-
+ CREATE TABLE new_table(mycol int);
+ SELECT oid AS old_oid, mycol INTO tmp_table FROM old_table;
+ COPY tmp_table TO '/tmp/pgtable';
+ COPY new_table WITH OIDS FROM '/tmp/pgtable';
+ DROP TABLE tmp_table;
OID ¤Ï¡¢4¥Ð¥¤¥È¤ÎÀ°¿ô¤È¤·¤ÆÊݸ¤µ¤ì¤Æ¤¤¤ë¤Î¤Ç¡¢40²¯¤ò±Û¤¨¤ë¤È°î¤ì¤Æ¤·¤Þ¤¦¤Ç¤·¤ç
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CURRENT_TIMESTAMP¤ò»È¤¤¤Þ¤¹:
- CREATE TABLE test (x int, modtime timestamp DEFAULT >CURRENT_TIMESTAMP );
+ CREATE TABLE test (x int, modtime timestamp DEFAULT CURRENT_TIMESTAMP );
4.22) ¤Ê¤¼¡¢IN¤ò»È¤¦ÉûÌ䤤¹ç¤ï¤»¤¬¤È¤Æ¤âÃÙ¤¤¤Î¤Ç¤¹¤«¡©
SELECT *
FROM tab
- WHERE col1 IN (SELECT subcol FROM subtab)
+ WHERE col IN (SELECT subcol FROM subtab)
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SELECT tab1.col1, tab2.col2
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-7.3¤Ç¤Ï´Ø¿ô¤«¤é¡¢Ê£¿ô¹Ô¤Î¤äÊ£¿ô¥«¥é¥à¤ò´Êñ¤ËÊÖ¤»¤Þ¤¹¡£ http://
+7.3¤Ç¤Ï´Ø¿ô¤«¤é¡¢Ê£¿ô¤Î¥í¥¦¤äÊ£¿ô¥«¥é¥à¤ò´Êñ¤ËÊÖ¤»¤Þ¤¹¡£ http://
techdocs.postgresql.org/guides/SetReturningFunctions¡£
4.26)¤Ê¤¼¡¢PL/PgSQL ´Ø¿ô¤ÎÃ椫¤é°ì»þ¥Æ¡¼¥Ö¥ë¤ò³Î¼Â¤Ë create/drop ¤¹¤ë¤³¤È¤¬¤Ç¤
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- ºÇ½ª¹¹¿·Æü: 2004ǯ04·î28Æü
+ ºÇ½ª¹¹¿·Æü: 2004ǯ08·î22Æü
ËÝÌõ¼Ô: ·¬Â¼ ½á (Jun Kuwamura <juk at PostgreSQL.jp>)
¤³¤ÎFAQ¤ÎÏÂÌõ¤ÎºîÀ®¤Ë¤¢¤¿¤ê¶¨ÎϤò¤·¤Æ¤¯¤À¤µ¤Ã¤¿Êý¡¹(·É¾Î¤Ïά¤µ¤»¤Æ¤¤¤¿¤À¤¤Þ¤¹):
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-ÏÂÌõ¤Î¤¤Ã¤«¤±¤òºî¤Ã¤Æ¤¯¤ì¤¿ JF(Linux Japanese FAQ Mailing List)¥×¥í¥¸¥§¥¯¥È¡¢¤½¤Î¾¡¢
-ľÀܤ¢¤ë¤¤¤Ï´ÖÀÜŪ¤Ë¤«¤«¤ï¤Ã¤Æ¤¤¤ë¤¹¤Ù¤Æ¤Î¥ª¡¼¥×¥ó¥½¡¼¥¹¥³¥ß¥å¥Ë¥Æ¥£¡¼¤Î³§¤µ¤ó¤Ë´¶¼Õ¤·¤Þ¤¹¡£
+ÏÂÌõ¤Î¤¤Ã¤«¤±¤òºî¤Ã¤Æ¤¯¤ì¤¿ JF(Linux Japanese FAQ Mailing List)¥×¥í¥¸¥§¥¯¥È¡¢
+¤½¤Î¾¡¢Ä¾Àܤ¢¤ë¤¤¤Ï´ÖÀÜŪ¤Ë¤«¤«¤ï¤Ã¤Æ¤¤¤ë¤¹¤Ù¤Æ¤Î¥ª¡¼¥×¥ó¥½¡¼¥¹¥³¥ß¥å¥Ë¥Æ¥£¡¼¤Î³§¤µ¤ó¤Ë´¶¼Õ¤·¤Þ¤¹¡£
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http://www.rccm.co.jp/~juk/pgsql/(FAQÏÂÌõ PostgreSQL ¤Ë¤Ä¤¤¤Æ¤è¤¯¤¢¤ë¼ÁÌä)
<H1>
PostgreSQL(¥Ý¥¹¥È¥°¥ì¥¹¡¦¥¥å¡¼¡¦¥¨¥ë)¤Ë¤Ä¤¤¤Æ¤è¤¯¤¢¤ë¼ÁÌä¤È¤½¤Î²òÅú(FAQ)</H1>
<P>
-¸¶Ê¸ºÇ½ª¹¹¿·Æü: Mon Mar 29 00:07:11 EST 2004</P>
+¸¶Ê¸ºÇ½ª¹¹¿·Æü: Fri Jun 4 00:09:16 EDT 2004</P>
<P>
¸½ºß¤Î°Ý»ý´ÉÍý¼Ô: Bruce Momjian (<A
HREF="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
¤³¤ÎÏÂÌõ¤Ë¤Ä¤¤¤Æ¤ªµ¤¤Å¤¤ÎÅÀ¤Ï(<A HREF="mailto:juk at PostgreSQL.jp">juk at PostgreSQL.jp</A>)¤Þ¤Ç¥á¡¼¥ë¤Ç¤ª´ó¤»²¼¤µ¤¤¡£
- 2003ǯ09·î20Æü ·¬Â¼ ½á
+ 2004ǯ08·î22Æü ·¬Â¼ ½á
]
</PRE></SMALL>
<A HREF="#3.8">3.8</A>) Àܳ¤·¤è¤¦¤È¤¹¤ë¤È¤¤Ë <I>'Sorry, too many clients'</I> ¤¬½Ð¤ë¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©<BR>
<A HREF="#3.9">3.9</A>) <I>pgsql_tmp</I> ¥Ç¥£¥ì¥¯¥È¥ê¤ÎÃæ¤Ë¤Ï²¿¤¬¤¢¤ê¤Þ¤¹¤«¡©<BR>
<A href="#3.10">3.10</A>) PostgreSQL¤Î¥á¥¸¥ã¡¼¥ê¥ê¡¼¥¹¤ò¥¢¥Ã¥×¥Ç¡¼¥È¤¹¤ë¤Î¤Ë¥À¥ó¥×¤È¥ê¥¹¥È¥¢¤ò¤·¤Ê¤¯¤Æ¤Ï¤Ê¤é¤Ê¤¤¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©<br>
+<A href="#3.11">3.11</A>) ¥Ï¡¼¥É¥¦¥§¥¢¤Ë¤Ï¤É¤ó¤Ê¥³¥ó¥Ô¥å¡¼¥¿¤ò»È¤¨¤Ð¤è¤¤¤Ç¤¹¤«¡©<BR>
<H4><A NAME="1.1">1.1</A>) PostgreSQL ¤È¤Ï²¿¤Ç¤¹¤«¡© ²¿¤ÈÆɤߤޤ¹¤«¡©</H4>
-<P><I>Post-Gres-Q-L.</I>(¥Ý¥¹¥È - ¥°¥ì¥¹ - ¥¥å¡¼ - ¥¨¥ë) ¤Èȯ²»¤·¤Þ¤¹¡£
+<P><I>Post-Gres-Q-L</I>(¥Ý¥¹¥È - ¥°¥ì¥¹ - ¥¥å¡¼ - ¥¨¥ë) ¤Èȯ²»¤·¤Þ¤¹¡£
¤³¤Îȯ²»¤òʹ¤¤¿¤¤¿Í¤Î¤¿¤á¤Ë¡¢¥ª¡¼¥Ç¥£¥ª¥Õ¥¡¥¤¥ë¤ò http://www.postgresql.org/postgresql.mp3 ¤ËÍÑ°Õ¤·¤Æ¤¢¤ê¤Þ¤¹¡£</P>
<P>PostgreSQL ¤Ï¼¡À¤Âå <SMALL>DBMS</SMALL> ¸¦µæÍѤΥץí¥È¥¿¥¤¥×¤Ç¤¢¤Ã¤¿ POSTGRES ¥Ç¡¼¥¿¥Ù¡¼¥¹´ÉÍý¥·¥¹¥Æ¥à¤Î²þÎÉÈǤǤ¹¡Ê¤³¤Î¤¿¤á¡¢º£¤Ç¤â¤È¤¤É¤ "Postgres" ¤È¸Æ¤Ð¤ì¤ë¤³¤È¤¬¤¢¤ê¤Þ¤¹¡Ë¡£PostgreSQL ¤Ï POSTGRES ¤Î¶¯ÎϤʥǡ¼¥¿¡¦¥â¥Ç¥ë¤ÈËÉ٤ʥǡ¼¥¿¡¦¥¿¥¤¥×(·¿)¤òÊÝ»ý¤·¤Ê¤¬¤é¡¢POSTGRES ¤Ç»È¤ï¤ì¤¿ PostQuel Ì䤤¹ç¤ï¤»¸À¸ì¤ò¡¢³ÈÄ¥¤·¤¿ <SMALL>SQL</SMALL> ¤Î¥µ¥Ö¥»¥Ã¥È¤ËÃÖ¤´¹¤¨¤Æ¤¤¤Þ¤¹¡£PostgreSQL ¤Ï̵ÎÁ¤Ç´°Á´¤Ê¥½¡¼¥¹¤òÍøÍѤǤ¤Þ¤¹¡£
"http://www.PostgreSQL.org/docs/faqs/FAQ_DEV.html">http://www.PostgreSQL.org/docs/faqs/FAQ_DEV.html</A> ¤Ë¤¢¤ë³«È¯¼Ô¸þ¤±¤ÎFAQ¤ò¸«¤Æ¤¯¤À¤µ¤¤¡£
</P>
-<P>Postgres95-1.01 ¤ÎÃ濴Ū¤Ê³«È¯¼Ô¤Ï Andrew Yu ¤È Jolly Chen ¤Ç¤·¤¿¤¬¡¢¤½¤Î¾ÂçÀª¤Î¿Í¡¹¤¬¤³¤Î¥³¡¼¥É¤Î°Ü¿¢¡¢¥Æ¥¹¥È¡¢¥Ç¥Ð¥°¡¢¤ª¤è¤Ó¡¢²þÎɤ˻²²Ã¤·¤Þ¤·¤¿¡£PostgreSQL ¤ÎÇÉÀ¸¸µ¥³¡¼¥É¤Ç¤¢¤ë POSTGRES ¤Ï¥«¥ê¥Õ¥©¥ë¥Ë¥¢Âç³Ø¥Ð¡¼¥¯¥ì¥¤¹»¤Ë¤ª¤¤¤Æ¡¢ Michael Stonebraker ¶µ¼ø¤Î»Ø´ø¤Î¤â¤È¡¢Â¿¤¯¤Î³ØÀ¸¡¢Â´¶ÈÀ¸¡¢ËÜ¿¦¤Î¥×¥í¥°¥é¥Þ¤¿¤Á¤ÎÅØÎϤˤè¤êºî¤é¤ì¤Þ¤·¤¿¡£
+<P>Postgres95-1.01 ¤ÎÃ濴Ū¤Ê³«È¯¼Ô¤Ï Andrew Yu ¤È Jolly Chen ¤Ç¤·¤¿¤¬¡¢¤½¤Î¾ÂçÀª¤Î¿Í¡¹¤¬¤³¤Î¥³¡¼¥É¤Î°Ü¿¢¡¢¥Æ¥¹¥È¡¢¥Ç¥Ð¥°¡¢¤ª¤è¤Ó¡¢²þÎɤ˻²²Ã¤·¤Þ¤·¤¿¡£PostgreSQL ¤ÎÇÉÀ¸¸µ¥³¡¼¥É¤Ç¤¢¤ë Postgres ¤Ï¥«¥ê¥Õ¥©¥ë¥Ë¥¢Âç³Ø¥Ð¡¼¥¯¥ì¥¤¹»¤Ë¤ª¤¤¤Æ¡¢ Michael Stonebraker ¶µ¼ø¤Î»Ø´ø¤Î¤â¤È¡¢Â¿¤¯¤Î³ØÀ¸¡¢Â´¶ÈÀ¸¡¢ËÜ¿¦¤Î¥×¥í¥°¥é¥Þ¤¿¤Á¤ÎÅØÎϤˤè¤êºî¤é¤ì¤Þ¤·¤¿¡£
<P>¥Ð¡¼¥¯¥ì¥¤¤Ë¤ª¤±¤ë¤³¤Î¥½¥Õ¥È¥¦¥§¥¢¤Î¤â¤È¤Î̾Á°¤Ï Postgres ¤Ç¤·¤¿¤¬¡¢<SMALL>SQL</SMALL> ¤Îµ¡Ç½¤¬Äɲ䵤줿 1995 ǯ¤Ë¤½¤Î̾Á°¤Ï Postgres95 ¤ËÊѹ¹¤µ¤ì¡¢1996 ǯ¤Î½ª¤ê¤Ë¤½¤Î̾Á°¤Ï PostgreSQL ¤ËÊѹ¹¤µ¤ì¤Þ¤·¤¿¡£
<P> Win32 <I>libpq</I> ¥é¥¤¥Ö¥é¥ê¤È psql ¤òºî¤ë¤¿¤á¤Ë¡¢<I>win32.mak</I> ¤¬ÇÛÉۤ˴ޤޤì¤Æ¤Þ¤¹¡£PostgreSQL¤Ï <SMALL>ODBC</SMALL> ¥¯¥é¥¤¥¢¥ó¥È¤È¤âÄÌ¿®¤Ç¤¤Þ¤¹¡£</P>
<P><STRONG>¥µ¡¼¥Ð</STRONG></P>
+
<P> ¸½ºß¡¢Cygnus Unix/NT °Ü¿¢¥é¥¤¥Ö¥é¥ê¤Î Cygwin ¤ò»È¤Ã¤Æ¡¢PostgreSQL ¥Ç¡¼¥¿¥Ù¡¼¥¹¥µ¡¼¥Ð¤Ï Windows NT ¤È Win2k ¾å¤Ç²ÔƯ¤·¤Æ¤¤¤Þ¤¹¡£ÇÛÉۤ˴ޤޤì¤ë<I>pgsql/doc/FAQ_MSWIN</I>¡¢¤¢¤ë¤¤¤Ï¡¢
<A href="http://www.PostgreSQL.org/docs/faqs/text/FAQ_MSWIN">http://www.PostgreSQL.org/docs/faqs/text/FAQ_MSWIN</A>¤Ë¤¢¤ë MS Windows FAQ ¤ò¤´Í÷²¼¤µ¤¤¡£</P>
+
<P>MS Win NT/2000/XP ¥Í¥¤¥Æ¥£¥ÖÈǤؤΰܿ¢¤¬¸½ºß¿Ê¹ÔÃæ¤Ç¤¹¡£¤â¤Ã¤È¾Ü¤·¤¤WindowsÈÇPostgreSQL¤Î¶á¶·¤Ï¡¢<a href="http://techdocs.postgresql.org/guides/Windows">http://techdocs.postgresql.org/guides/Windows</a>¤È
<a href="http://momjian.postgresql.org/main/writings/pgsql/win32.html">
http://momjian.postgresql.org/main/writings/pgsql/win32.html</a>
¤ò¸«¤Æ¤¯¤À¤µ¤¤¡£
</p>
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-<PRE>
- Windows-Native ¥µ¡¼¥Ð¡¼ & ¥¯¥é¥¤¥¢¥ó¥È¥Ñ¥Ã¥±¡¼¥¸¤¬ÀÆÆ£¤µ¤ó¤Ë¤è¤ê
- °Ý»ý´ÉÍý¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
- <A href="http://hp.vector.co.jp/authors/VA023283/PostgreSQL.html">http://hp.vector.co.jp/authors/VA023283/PostgreSQL.html</A>
- (Windows-Native Server&Client Package for PostgreSQL by Hiroshi Saito)
- <A href="http://hp.vector.co.jp/authors/VA023283/PostgreSQLe.html">http://hp.vector.co.jp/authors/VA023283/PostgreSQLe.html</A>
+ <p>Novell Netware 6 ¤Î°Ü¿¢¤â¤¢¤ê¤Þ¤¹¡£
+ <a href="http://forge.novell.com">http://forge.novell.com</a>.</p>
-</PRE>
-<BR>
-]
<BR>
°Ê²¼¤ÏÆüËܤΥߥ顼¥µ¥¤¥È¤Ç¤¹:
+ Japan: <A HREF="ftp://ftp.jp.postgresql.org/">ftp://ftp.jp.postgresql.org/</A>
Japan: <A HREF="ftp://mirror.nucba.ac.jp/mirror/PostgreSQL/pub/">ftp://mirror.nucba.ac.jp/mirror/PostgreSQL/pub/</A>
Japan: <A HREF="ftp://ring.ip-kyoto.ad.jp/pub/misc/db/PostgreSQL/">ftp://ring.ip-kyoto.ad.jp/pub/misc/db/PostgreSQL/</A>
Japan: <A HREF="ftp://ring.crl.go.jp/pub/misc/db/PostgreSQL/">ftp://ring.crl.go.jp/pub/misc/db/PostgreSQL/</A>
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BEGIN;
ALTER TABLE tab ADD COLUMN new_col <i>new_data_type</i>;
UPDATE tab SET new_col = CAST(old_col AS <i>new_data_type</i>);
- ALTER TABLE DROP tab COLUMN old_col;
+ ALTER TABLE tab DROP COLUMN old_col;
COMMIT;
</PRE>
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+ 32 bytes: ³Æ¥í¥¦¤Î¥Ø¥Ã¥À(³µ»»)
24 bytes: À°¿ô(int)¥Õ¥£¡¼¥ë¥É¤È¥Æ¥¥¹¥È(text)¥Õ¥£¡¼¥ë¥É
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----------------------------------------
- 64 bytes per row
+ 60 bytes per row
PostgreSQL ¤Î¥Ç¡¼¥¿¥Ú¡¼¥¸¥µ¥¤¥º¤Ï 8192¥Ð¥¤¥È(8KB)¤Ê¤Î¤Ç:
8192 bytes per page
- ------------------- = 128 rows per database page (ÀÚ¤ê¾å¤²)
- 64 bytes per row
+ ------------------- = 136 rows per database page (ÀÚ¤ê¼Î¤Æ)
+ 60 bytes per row
100000 data rows
- -------------------- = 782 database pages
+ -------------------- = 782 database pages (ÀÚ¤ê¾å¤²)
128 rows per page
-782 database pages * 8192 bytes per page = 6,406,144 bytes (6.4 MB)
+ 735 database pages * 8192 bytes per page = 6,021,120 bytes (6 MB)
</PRE>
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+
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<H4><A NAME="4.8">4.8</A>) Ì䤤¹ç¤ï¤»¤¬ÃÙ¤¤¤¦¤¨¡¢¥¤¥ó¥Ç¥Ã¥¯¥¹¤ò»È¤Ã¤Æ¤¤¤ëÍͻҤ¬¤¢¤ê¤Þ¤»¤ó¡£¤Ê¤¼¤Ç¤¹¤«¡©
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ANALYZE</SMALL>¤Þ¤¿¤Ï¡¢Ã±¤Ë <SMALL>ANALYZE</SMALL> ¤ò»È¤Ã¤Æ¼ý½¸¤¹¤ë¤³¤È
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LIMIT 1;
</PRE>
- <P>¤â¤·¡¢¥ª¥×¥Æ¥£¥Þ¥¤¥¶¤¬´Ö°ã¤Ã¤Æ¥·¡¼¥±¥ó¥·¥ã¥ë¥¹¥¥ã¥ó¤òÁªÂò¤·¤¿¤³¤È¤Ëµ¿¤¤¤¬¤Ê¤±¤ì¤Ð¡¢<CODE>SET enable_seqscan TO 'off'</CODE>¤ò»È¤Ã¤Æ¥¤¥ó¥Ç¥¯¥¹¥¹¥¥ã¥ó¤Ç¤Þ¤Á¤¬¤¤¤Ê¤¯Â®¤¯¤Ê¤Ã¤Æ¤¤¤ë¤«¤ò¥Æ¥¹¥È¤ò¤·¤Æ¤ß¤Æ¤¯¤À¤µ¤¤¡£</P>
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</PRE>
-
-
-<PRE>
- WHERE lower(textfield) LIKE lower(pattern)
-</PRE>
-
-
<P>
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</H4>
<PRE>
Type Internal Name Notes
--------------------------------------------------
-CHAR(n) bpchar »ØÄꤵ¤ì¤¿¸ÇÄêĹ¤È¤Ê¤ë¤è¤¦¤Ë¶õÇò¤¬µÍ¤á¤é¤ì¤ë
-"char" char £±Ê¸»ú
VARCHAR(n) varchar ºÇÂçĹ¤Î¥µ¥¤¥º¤ò»ØÄꤹ¤ë¡¢µÍ¤áʪ̵¤·
+CHAR(n) bpchar »ØÄꤵ¤ì¤¿¸ÇÄêĹ¤È¤Ê¤ë¤è¤¦¤Ë¶õÇò¤¬µÍ¤á¤é¤ì¤ë
TEXT text Ťµ¤Ë¾å¸Â¤Î̵¤¤¥Æ¥¥¹¥È
BYTEA bytea ²ÄÊÑĹ¤Î¥Ð¥¤¥ÈÇÛÎó(null-byte safe)
+"char" char £±Ê¸»ú
</PRE>
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- Bruce Momjian ¤Î<A HREF="http://www.PostgreSQL.org/docs/aw_pgsql_book">(http://www.PostgreSQL.org/docs/aw_pgsql_book)¤Î Numbering Rows</A>¤Î¾Ï¤Ë¤¢¤ê¤¢¤Þ¤¹¡£
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<PRE>
- CREATE TABLE new (old_oid oid, mycol int);
- SELECT old_oid, mycol INTO new FROM old;
- COPY new TO '/tmp/pgtable';
- DELETE FROM new;
- COPY new WITH OIDS FROM '/tmp/pgtable';
-<!--
- CREATE TABLE new_table (mycol int);
- INSERT INTO new_table (oid, mycol) SELECT oid, mycol FROM old_table;
--->
+ CREATE TABLE new_table(mycol int);
+ SELECT oid AS old_oid, mycol INTO tmp_table FROM old_table;
+ COPY tmp_table TO '/tmp/pgtable';
+ COPY new_table WITH OIDS FROM '/tmp/pgtable';
+ DROP TABLE tmp_table;
</PRE>
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<P><i>CURRENT_TIMESTAMP</i>¤ò»È¤¤¤Þ¤¹:
<PRE>
- CREATE TABLE test (x int, modtime timestamp DEFAULT >CURRENT_TIMESTAMP );
+ CREATE TABLE test (x int, modtime timestamp DEFAULT CURRENT_TIMESTAMP );
</PRE>
<P>
<PRE>
SELECT *
FROM tab
- WHERE col1 IN (SELECT subcol FROM subtab)
+ WHERE col IN (SELECT subcol FROM subtab)
</PRE>
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FROM t1 LEFT OUTER JOIN t2 USING (col);
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