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PostgreSQL ¤Î¥Ç¡¼¥¿¥Ú¡¼¥¸¥µ¥¤¥º¤Ï 8192¥Ð¥¤¥È(8KB)¤Ê¤Î¤Ç:
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+ VARCHAR(n) varchar ºÇÂçĹ¤Î¥µ¥¤¥º¤ò»ØÄꤹ¤ë¡¢µÍ¤áʪ̵¤·
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- CREATE TABLE person (
- id SERIAL,
- name TEXT
+ CREATE TABLE person (
+ id SERIAL,
+ name TEXT
);
¤Ï¼«Æ°Åª¤Ë¼¡¤Î¤è¤¦¤ËËÝÌõ¤µ¤ì¤Þ¤¹:
CREATE SEQUENCE person_id_seq;
- CREATE TABLE person (
+ CREATE TABLE person (
id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
name TEXT
);
PostgreSQL¤Ç¤Ä¤¯¤é¤ì¤ë¤¹¤Ù¤Æ¤Î¥í¥¦¤Ï¡¢WITHOUT OIDS ¤Ç¤Ä¤¯¤é¤ì¤Ê¤¤¤«¤®¤ê°ì°Õ¤Î
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+
+The most common cause is the use of double-quotes around table or + column
+names during table creation. When double-quotes are used, + table and column
+names (called identifiers) are stored case-sensitive, meaning you must use +
+double-quotes when referencing the names in a query. Some interfaces, + like
+pgAdmin, automatically double-quote identifiers during table + creation. So,
+for identifiers to be recognized, you must either: ¤â¤Ã¤È¤â°ìÈÌŪ¤Ê¸¶°ø¤Ï¡¢¥Æ¡¼
+¥Ö¥ë¤òºîÀ®¤¹¤ëºÝ¤Ë¡¢¥Æ¡¼¥Ö¥ë¤ä¥«¥é¥à¤ò°Ï¤¦Æó½Å°úÍÑÉä¤Î»ÈÍѤǤ¹¡£Æó½Å°úÍÑÉä¤ò»È
+¤¦¤È¡¢¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°¡Ê¼±Ê̻ҤȸƤӤޤ¹¡Ë¤ÏÂçʸ»ú¤È¾®Ê¸»ú¤Î¶èÊ̤ò¤·¤Æ³Ê
+Ǽ¤µ¤ì¤¹¡£¤·¤¿¤¬¤Ã¤Æ¡¢pgAdmin¤Î¤è¤¦¤Ë¥Æ¡¼¥Ö¥ëºîÀ®¤Î¤È¤¤Ë¼«Æ°Åª¤ËÆó½Å°úÍÑÉä¤ò»È
+¤¦¤â¤Î¤Ï¥¯¥¨¥ê¤ÎÃæ¤Ç¤½¤ì¤é¤Î̾Á°¤ò»È¤¦¤È¤¤ËÆó½Å°úÍÑÉä¤òÉÕ¤±¤Ê¤¯¤Æ¤Ï¤Ê¤é¤Ê¤¤¤³
+¤È¤ò°ÕÌ£¤·¤Þ¤¹¡£¤³¤Î¤¿¤á¡¢¼±Ê̻Ҥòǧ¼±¤µ¤»¤ë¤¿¤á¤Ë¤Ï°Ê²¼¤Î¤¤¤º¤ì¤«¤ò¿´¤¬¤±¤Þ¤¹
+¡£
+
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+ ¡¦ Use only lowercase characters in identifiers
+ ¡¦ ¼±Ê̻ҤˤϾ®Ê¸»ú¤À¤±¤ò»È¤¦
+ ¡¦ ¥¯¥¨¥ê¤ÎÃæ¤Ç»²¾È¤¹¤ë¤È¤¤ÏÆó½Å°úÍÑÉè¤Ç¼±Ê̻Ҥò°Ï¤¦
+
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+ ºÇ½ª¹¹¿·Æü: 2005ǯ10·î05Æü
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¤³¤ÎFAQ¤ÎÏÂÌõ¤ÎºîÀ®¤Ë¤¢¤¿¤ê¶¨ÎϤò¤·¤Æ¤¯¤À¤µ¤Ã¤¿Êý¡¹(·É¾Î¤Ïά¤µ¤»¤Æ¤¤¤¿¤À¤¤Þ¤¹):
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- ¤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¡£
+ ¤ò¤Ï¤¸¤á¡¢¥Ý¥¹¥È¥°¥ì¥¹¤Ë´Ø¤¹¤ëÏÃÂêËÉÙ¤ÊÆüËܸìPostgreSQL¥á¡¼¥ê¥ó¥°¥ê¥¹¥È¡¢
+ ÏÂÌõ¤Î¤¤Ã¤«¤±¤òºî¤Ã¤Æ¤¯¤ì¤¿¤ê¡¢¤¤¤Ä¤â¥Á¥§¥Ã¥¯¤ò¤·¤Æ¤¯¤ì¤ë
+ JF(Linux Japanese FAQ)¥×¥í¥¸¥§¥¯¥È¡¢
+ FreeBSD ¥É¥¥å¥á¥ó¥Æ¡¼¥·¥ç¥ó¥×¥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¤Î¤ß¤Ê¤µ¤Þ¤Ë´¶¼Õ¤·¤Þ¤¹¡£
ÆüËܸìÈǤΤ³¤Îʸ½ñ¤Ï ËÜ²È "Frequently Asked Questions" ¤Î¥Ú¡¼¥¸¤Ë "Japanese FAQ" ¤È¤¤¤¦¸«½Ð¤Ç¤¢¤ê¤Þ¤¹¡£
¤Þ¤¿¡¢ºÇ¿·ÈǤϰʲ¼¤Î¥µ¥¤¥È¤Ë¤¢¤ê¤Þ¤¹¡£
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<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 May 9 13:15:04 EDT 2005</p>
+<p>¸¶Ê¸ºÇ½ª¹¹¿·Æü: Wed Sep 28 07:45:42 EDT 2005</p>
<p>¸½ºß¤Î°Ý»ý´ÉÍý¼Ô: Bruce Momjian (<A
href="mailto:pgman at candle.pha.pa.us">pgman at candle.pha.pa.us</a>)<br />
Maintainer of Japanese Translation: Jun Kuwamura (<A
[ÌõÃí¡§
ÆüËܸìÈǤÎÀ½ºî¤Ë¤Ä¤¤¤Æ¤Ï¡¢¤³¤Îʸ½ñ¤ÎºÇ¸å¤ò¤´¤é¤ó¤¯¤À¤µ¤¤¡£
- 2005ǯ05·î18Æü ·¬Â¼ ½á
+ 2005ǯ10·î05Æü ·¬Â¼ ½á
]
</pre></small>
</p>
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+<a href="#2.3">2.3</a>) PostgreSQL ¤Ë¥°¥é¥Õ¥£¥«¥ë¡¦¥æ¡¼¥¶¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ï¤¢¤ê¤Þ¤¹¤«¡©<br />
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+<a href="#4.21">4.21</a>) ¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°¤¬¥¯¥¨¥ê¡¼¤ÎÃæ¤Çǧ¼±¤µ¤ì¤Ê¤¤¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©<br />
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- ¤Èȯ²»¤·¤Þ¤¹¡£</p>¤Þ¤¿¡¢Ã±½ã¤Ë Postgres ¤È¤â¸Æ¤Ð¤ì¤Þ¤¹¡£
+ ¤Èȯ²»¤·¤Þ¤¹¡£</p>¤Þ¤¿¡¢¤È¤¤Ë¤è¤Ã¤Æ¤Ïñ½ã¤Ë <i>Postgres</i> ¤È¤·¤Æ
+ »²¾È¤µ¤ì¤Þ¤¹¡£¤³¤Îȯ²»¤òʹ¤¤¿¤¤¿Í¤Î¤¿¤á¤Ë¡¢
+ <a href="http://www.postgresql.org/files/postgresql.mp3">MP3¥Õ¥©¡¼
+ ¥Þ¥Ã¥È</a>¤Î²»À¼¥Õ¥¡¥¤¥ë¤¬¤¢¤ê¤Þ¤¹¡£</p>
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ÅÁÅýŪ¤Ê¾¦Íѥǡ¼¥¿¥Ù¡¼¥¹¥·¥¹¥Æ¥à¤Ë¡¢¼¡À¤Âå<small>DBMS</small>¥·¥¹¥Æ
<a href="http://www.PostgreSQL.jp/">http://www.PostgreSQL.jp/</a>
¤ò¤´¤é¤ó¤¯¤À¤µ¤¤¡£²ñ°÷ÅÐÏ¿¤â²Äǽ¤È¤Ê¤Ã¤Æ¤¤¤Þ¤¹¡£
- ÆüËܸì¤ÎIRC¥Á¥ã¥ó¥Í¥ë '#PostgreSQL*jp' ¤â¸ºß¤·¤Þ¤¹¡£
+ ÆüËܸì¤ÎIRC¥Á¥ã¥ó¥Í¥ë '#PostgreSQL:*.jp' ¤â¸ºß¤·¤Þ¤¹¡£
+ ]
</pre></small>
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+ ÆüËܸì¤Î½ñÀÒÅù¤Ë¤Ä¤¤¤Æ¤Ï¡¢ÆüËÜPostgreSQL¥æ¡¼¥¶²ñ¤Î¡¢<A
href="http://www.postgresql.jp/PostgreSQL/references.html">http://www.postgresql.jp/PostgreSQL/references.html</a>
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24 bytes: À°¿ô(int)¥Õ¥£¡¼¥ë¥É¤È¥Æ¥¥¹¥È(text)¥Õ¥£¡¼¥ë¥É
+ 4 bytes: ¥Ú¡¼¥¸¾å¤Î¥¿¥Ã¥×¥ë¤Ø¤Î¥Ý¥¤¥ó¥¿
----------------------------------------
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+ 56 bytes per row
PostgreSQL ¤Î¥Ç¡¼¥¿¥Ú¡¼¥¸¥µ¥¤¥º¤Ï 8192¥Ð¥¤¥È(8KB)¤Ê¤Î¤Ç:
8192 bytes per page
- ------------------- = 136 rows per database page (ÀÚ¤ê¼Î¤Æ)
- 60 bytes per row
+ ------------------- = 146 rows per database page (ÀÚ¤ê¼Î¤Æ)
+ 56 bytes per row
100000 data rows
- -------------------- = 782 database pages (ÀÚ¤ê¾å¤²)
- 128 rows per page
+ -------------------- = 685 database pages (ÀÚ¤ê¾å¤²)
+ 146 rows per page
- 735 database pages * 8192 bytes per page = 6,021,120 bytes (6 MB)
+ 685 database pages * 8192 bytes per page = 5,611,520 bytes (5.6 MB)
</pre>
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+<h4><a NAME="4.7">4.7</a>) Ì䤤¹ç¤ï¤»¥ª¥×¥Æ¥£¥Þ¥¤¥¶¤¬¤É¤Î¤è¤¦¤ËÌ䤤¹ç¤ï¤»¤òɾ²Á¤¹¤ë¤Î¤«¤ò¸«¤ë¤Ë¤Ï¤É¤¦¤·¤Þ¤¹¤«¡©</h4>
<p>¥ª¥ó¥é¥¤¥ó¥Þ¥Ë¥å¥¢¥ë¤Ç <small>EXPLAIN</small> ¤ò¸«¤Æ¤¯¤À¤µ¤¤¡£</p>
CREATE INDEX tabindex ON tab (lower(col));
</pre>
+ <p>¾åµ¤Î¥¤¥ó¥Ç¥Ã¥¯¥¹¤¬<small>UNIQUE</small>¤ÇºîÀ®¤µ¤ì¤¿¾ì¹ç¡¢¥«¥é¥à
+ ¤ÏÂçʸ»ú¤È¾®Ê¸»ú¤ò³ÊǼ¤Ç¤¤Þ¤¹¤¬¡¢¤½¤Î°ã¤¤¤¬Ê¸»ú¥±¡¼¥¹¤À¤±¤Ç¤¢¤Ã¤Æ¤â
+ Ʊ°ì¤Ë¤Ï¤Ê¤ê¤Þ¤»¤ó¡£¤¢¤¨¤ÆÆÃÄê¤Îʸ»ú¥±¡¼¥¹¤ò¥«¥é¥à¤Ë³ÊǼ¤¹¤ë¤Ë¤Ï
+ <small>CHECK</small>À©Ì󤫡¢¥È¥ê¥¬¡¼¤ò»È¤Ã¤Æ¤¯¤À¤µ¤¤¡£</p>
+
+
<h4><a name="4.9">4.9</a>) ¥¯¥¨¥ê¤ÎÃæ¤Ç¡¢¥Õ¥£¡¼¥ë¥É¤¬<small>NULL</small> ¤Ç¤¢¤ë¤³¤È¤ò¸¡½Ð¤¹¤ë¤Ë¤Ï¤É¤¦¤·¤Þ¤¹¤«¡© ¥Õ¥£¡¼¥ë¥É¤¬<small>NULL</small>¤«¤É¤¦¤«¤Ç¤É¤Î¤è¤¦¤Ë¥½¡¼¥È¤¬¤Ç¤¤Þ¤¹¤«¡©</h4>
O<small>ID</small>¤Ï¼«Æ°Åª¤Ë4¥Ð¥¤¥È¤ÎÀ°¿ô¤ÇÍ¿¤¨¤é¤ì¡¢¤½¤ì¤Ï¡¢Á´¥¤¥ó
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¥í¡¼¤·¡¢¤½¤·¤Æ¡¢O<small>ID</small>¤Ï½ÅÊ£¤ò¤·¤Ï¤¸¤á¤Þ¤¹¡£PostgreSQL¤Ï
- ÆâÉô¥·¥¹¥Æ¥à¥Æ¡¼¥Ö¥ë¤ò°ì½ï¤Ë¥ê¥ó¥¯¤¹¤ët¤¿¤á¤ËO<small>ID</small> ¤ò»È
+ ÆâÉô¥·¥¹¥Æ¥à¥Æ¡¼¥Ö¥ë¤ò°ì½ï¤Ë¥ê¥ó¥¯¤¹¤ë¤¿¤á¤ËO<small>ID</small> ¤ò»È
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+<h3><a name="4.21">4.21</a>)¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°¤¬¥¯¥¨¥ê¡¼¤ÎÃæ¤Çǧ¼±¤µ¤ì¤Ê¤¤¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©</h3>
+
+ <p>The most common cause is the use of double-quotes around table or
++ column names during table creation. When double-quotes are used,
++ table and column names (called identifiers) are stored <a href="http://www.postgresql.org/docs/8.0/static/sql-syntax.html#SQL-
++ SYNTAX-IDENTIFIERS">case-sensitive</a>, meaning you must use
++ double-quotes when referencing the names in a query. Some interfaces,
++ like pgAdmin, automatically double-quote identifiers during table
++ creation. So, for identifiers to be recognized, you must either:
+
+ ¤â¤Ã¤È¤â°ìÈÌŪ¤Ê¸¶°ø¤Ï¡¢¥Æ¡¼¥Ö¥ë¤òºîÀ®¤¹¤ëºÝ¤Ë¡¢¥Æ¡¼¥Ö¥ë¤ä¥«¥é¥à¤ò°Ï
+ ¤¦Æó½Å°úÍÑÉä¤Î»ÈÍѤǤ¹¡£Æó½Å°úÍÑÉä¤ò»È¤¦¤È¡¢¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°
+ ¡Ê¼±Ê̻ҤȸƤӤޤ¹¡Ë¤Ï<a
+ href="http://www.postgresql.org/docs/8.0/static/sql-syntax.html#SQL-SYNTAX-IDENTIFIERS">Âçʸ»ú¤È¾®Ê¸»ú¤Î¶èÊÌ</a>
+ ¤ò¤·¤Æ³ÊǼ¤µ¤ì¤¹¡£¤·¤¿¤¬¤Ã¤Æ¡¢pgAdmin¤Î¤è¤¦¤Ë¥Æ¡¼¥Ö¥ëºîÀ®¤Î¤È¤¤Ë¼«
+ ưŪ¤ËÆó½Å°úÍÑÉä¤ò»È¤¦¤â¤Î¤Ï¥¯¥¨¥ê¤ÎÃæ¤Ç¤½¤ì¤é¤Î̾Á°¤ò»È¤¦¤È¤¤ËÆó
+ ½Å°úÍÑÉä¤òÉÕ¤±¤Ê¤¯¤Æ¤Ï¤Ê¤é¤Ê¤¤¤³¤È¤ò°ÕÌ£¤·¤Þ¤¹¡£¤³¤Î¤¿¤á¡¢¼±Ê̻Ҥò
+ ǧ¼±¤µ¤»¤ë¤¿¤á¤Ë¤Ï°Ê²¼¤Î¤¤¤º¤ì¤«¤ò¿´¤¬¤±¤Þ¤¹¡£
+
+ <ul>
+ <li>¥Æ¡¼¥Ö¥ë¤òºîÀ®¤¹¤ë¤È¤¤ËÆó½Å°úÍÑÉä¤Ç¼±Ê̻Ҥò°Ï¤¦¤³¤È¤òÈò¤±¤ë</li>
+ <li>Use only lowercase characters in identifiers</li>
+ <li>¼±Ê̻ҤˤϾ®Ê¸»ú¤À¤±¤ò»È¤¦</li>
+ <li>¥¯¥¨¥ê¤ÎÃæ¤Ç»²¾È¤¹¤ë¤È¤¤ÏÆó½Å°úÍÑÉè¤Ç¼±Ê̻Ҥò°Ï¤¦</li>
+ </ul>
+
<hr />
<small><pre>
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- ºÇ½ª¹¹¿·Æü: 2005ǯ05·î18Æü
+ ºÇ½ª¹¹¿·Æü: 2005ǯ10·î05Æü
ËÝÌõ¼Ô: ·¬Â¼ ½á (<a href="mailto:juk at PostgreSQL.jp">Jun Kuwamura <juk at PostgreSQL.jp></a>)
¤³¤ÎFAQ¤ÎÏÂÌõ¤ÎºîÀ®¤Ë¤¢¤¿¤ê¶¨ÎϤò¤·¤Æ¤¯¤À¤µ¤Ã¤¿Êý¡¹(·É¾Î¤Ïά¤µ¤»¤Æ¤¤¤¿¤À¤¤Þ¤¹):
°ðÍÕ ¹áÍý(<a href="mailto:i-kaori at sra.co.jp">Kaori Inaba <i-kaori at sra.co.jp></a>)
Àаæ ãÉ×(<a href="mailto:t-ishii at sra.co.jp">Tatsuo Ishii <t-ishii at sra.co.jp></a>)
- ¤ò¤Ï¤¸¤á¡¢¥Ý¥¹¥È¥°¥ì¥¹¤Ë´Ø¤¹¤ëÏÃÂêËÉÙ¤ÊÆüËܸì¥Ý¥¹¥È¥°¥ì¥¹¡¦¥á¡¼¥ê¥ó¥°¥ê
- ¥¹¥È¡¢ ÏÂÌõ¤Î¤¤Ã¤«¤±¤òºî¤Ã¤Æ¤¯¤ì¤¿ <a
- href="http://jf.linux.or.jp/">JF(Linux Japanese FAQ Mailing List)¥×¥í¥¸¥§
- ¥¯¥È</a>¡¢FreeBSD ¥É¥¥å¥á¥ó¥Æ¡¼¥·¥ç¥ó¥×¥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¡£
+ ¤ò¤Ï¤¸¤á¡¢¥Ý¥¹¥È¥°¥ì¥¹¤Ë´Ø¤¹¤ëÏÃÂêËÉÙ¤ÊÆüËܸìPostgreSQL¥á¡¼¥ê¥ó¥°¥ê¥¹¥È¡¢
+ ÏÂÌõ¤Î¤¤Ã¤«¤±¤òºî¤Ã¤Æ¤¯¤ì¤¿¤ê¡¢¤¤¤Ä¤â¥Á¥§¥Ã¥¯¤ò¤·¤Æ¤¯¤ì¤ë
+ <a href="http://jf.linux.or.jp/">JF(Linux Japanese FAQ)¥×¥í¥¸¥§¥¯¥È</a>¡¢
+ FreeBSD ¥É¥¥å¥á¥ó¥Æ¡¼¥·¥ç¥ó¥×¥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¤Î¤ß¤Ê¤µ¤Þ¤Ë´¶¼Õ¤·¤Þ¤¹¡£
ÆüËܸìÈǤΤ³¤Îʸ½ñ¤Ï <a href="http://www.postgresql.org/docs/faq/">ËÜ²È "Frequently Asked Questions" </a> ¤Î¥Ú¡¼¥¸¤Ë "Japanese FAQ" ¤È¤¤¤¦¸«½Ð¤Ç¤¢¤ê¤Þ¤¹¡£
¤Þ¤¿¡¢ºÇ¿·ÈǤϰʲ¼¤Î¥µ¥¤¥È¤Ë¤¢¤ê¤Þ¤¹¡£
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