projects / postgresql.git / commitdiff
| author | Bruce Momjian | |
| Thu, 8 Mar 2001 17:00:28 +0000 (17:00 +0000) | ||
| committer | Bruce Momjian | |
| Thu, 8 Mar 2001 17:00:28 +0000 (17:00 +0000) |
| doc/FAQ_japanese | [new file with mode: 0644] | patch | blob |
| doc/src/FAQ/FAQ_japanese.html | [new file with mode: 0644] | patch | blob |
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+ CREATE SEQUENCE person_id_seq;
+ CREATE TABLE person (
+ id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
+ name TEXT
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+ CREATE UNIQUE INDEX person_id_key ON person ( id );
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+ INSERT INTO person (name) VALUES ('Blaise Pascal');
+ $newID = currval('person_id_seq');
+
+
+ºÇ¸å¤Ë¡¢
+
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+
+
+¤¢¤ê¤Þ¤»¤ó¡£¥Ð¥Ã¥¯¥¨¥ó¥É¤Ç½èÍý¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
+
+
+
+
+
+
+
+
+
+
+
+
+
+ CREATE TABLE new_table(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';
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
++href="http://www.comptechnews.com/~reaster/dbdesign.html">
+http://www.comptechnews.com/~reaster/dbdesign.html
+¤Ç¸«¤Ä¤±¤é¤ì¤Þ¤¹¡£
+
+
+
+
+
+¥·¥¹¥Æ¥à¤Î²¾ÁÛ¥á¥â¥ê¡¼¤òÁ´¤Æ»È¤¤²Ì¤¿¤·¤Æ¤·¤Þ¤Ã¤Æ¤¤¤ë²ÄǽÀ¤¬¤¢¤ë¤«¡¢¤¢¤ë¤¤¤Ï
+¥«¡¼¥Í¥ë¤¬¤¢¤ë¥ê¥½¡¼¥¹¤Ë¤Ä¤¤¤ÆÄ㤤À©¸ÂÃͤò»ý¤Ã¤Æ¤¤¤ë²ÄǽÀ¤¬¤¢¤ê¤Þ¤¹¡£
+postmaster ¤ò³«»Ï¤¹¤ëÁ°¤Ë¤³¤ì¤ò»î¤·¤Æ¤ß¤Æ²¼¤µ¤¤¡§
+
+
+ ulimit -d 262144
+ limit datasize 256m
+
+
+
+¥·¥§¥ë¤Ë¤è¤Ã¤Æ¡¢¤É¤Á¤é¤«¤Ò¤È¤Ä¤¬À®¸ù¤¹¤ë¤Ç¤·¤ç¤¦¤¬¡¢¤³¤ì¤Ï¥×¥í¥»¥¹¤Î¥Ç¡¼¥¿¥»¥°¥á¥ó¥ÈÀ©¸Â¤ò¤è¤ê¹â¤¯ÀßÄꤷ¡¢¤¿¤Ö¤óÌ䤤¹ç¤ï¤»¤¬´°·ë¤¹¤ë¤è¤¦¤Ë¤Ê¤ë¤Ç¤·¤ç¤¦¡£¤³¤Î¥³¥Þ¥ó¥É¤Ï¸½¹Ô¤Î¥×¥í¥»¥¹¤È¡¢¤³¤Î¥³¥Þ¥ó¥É¤òÁö¤é¤»¤¿¸å¤Ëºî¤é¤ì¤ëÁ´¤Æ¤Î¥µ¥Ö¥×¥í¥»¥¹¤Ë¤Ä¤¤¤ÆŬÍѤµ¤ì¤Þ¤¹¡£¥Ð¥Ã¥¯¥¨¥ó¥É¤¬¤È¤Æ¤â¿¤¯¤Î¥Ç¡¼¥¿¤òÊÖ¤¹¤¿¤á¤Ë
+
+
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+
+psql ¤«¤é select version(); ¤ò¥¿¥¤¥×¤·¤Þ¤¹¡£
+
+
+
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+
+
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+
+
+ CREATE TABLE test (x int, modtime timestamp DEFAULT now() );
+
+
+
+
+
+
+
+¸½ºß¡¢³°ÉôÌ䤤¹ç¤ï¤»¤Î³Æ¹Ô¤Ë¤Ä¤¤¤ÆÉûÌ䤤¹ç¤ï¤»¤Î·ë²Ì¤ò½çÈ֤˥¹¥¥ã¥ó¤¹¤ë¤³¤È¤Ë¤è¤ê¡¢ÉûÌ䤤¹ç¤ï¤»¤ò³°ÉôÌ䤤¹ç¤ï¤»¤Ë·ë¹ç¤·¤Æ¤¤¤Þ¤¹¡£ÅöÌ̤Ï
+
+ SELECT *
+ FROM tab
+ WHERE col1 IN (SELECT col2 FROM TAB2)
+
+¤ò¡¢ÃÖ¤´¹¤¨¤Æ¡§
+
+ SELECT *
+ FROM tab
+ WHERE EXISTS (SELECT col2 FROM TAB2 WHERE col1 = col2)
+
+¤È¤·¤Þ¤¹¡£
+¤³¤ÎÀ©¸Â¤Ï¾Íè¤Î¥ê¥ê¡¼¥¹¤Çľ¤·¤¿¤¤¤È»×¤Ã¤Æ¤¤¤Þ¤¹¡£
+
+
+
+
+PostgreSQL 7.1 °Ê¹ß¤Ç¤Ï
+
+
SELECT *
+ FROM t1 LEFT OUTER JOIN t2 ON (t1.col = t2.col);
+¤¢¤ë¤¤¤Ï
+
SELECT *
+ FROM t1 LEFT OUTER JOIN t2 USING (col);
+
+¤³¤ì¤é¤Î¾ÝħŪ¤ÊÌ䤤¹ç¤ï¤»¤Ç¤Ï t1.col ¤ò t2.col ¤È·ë¹ç¤·¤Æ¡¢t1 ¤Î
+·ë¹ç¤µ¤ì¤Ê¤«¤Ã¤¿¹Ô(t2 ¤È°ìÃפ·¤Ê¤«¤Ã¤¿¹Ô)¤âÊÖ¤·¤Æ¤¤¤Þ¤¹¡£
+
+
+
+
+
+
+
+
+
++These identical queries join t1.col to t2.col, and also return any unjoined
++rows in t1 (those with no match in t2). A
++would add unjoined rows of t2. A
++the matched rows plus all unjoined rows from t1 and t2. The word
++is optional and is assumed in
++and
++joins.
+
+
+°ÊÁ°¤Î¥ê¥ê¡¼¥¹¤Ç¤Ï³°Éô·ë¹ç(outer join)¤ò
+¤¿¤È¤¨¤Ð¡¢tab1 ¤È tab2 ¤ò·ë¹ç¤¹¤ë¤È¤¤Ï¡¢¼¡¤ÎÌ䤤¹ç¤ï¤»¤ÇÆó¤Ä¤Î¥Æ¡¼¥Ö¥ë¤ò³°Éô·ë¹ç¤·¤Þ¤¹¡£
+
+
+ SELECT tab1.col1, tab2.col2
+ FROM tab1, tab2
+ WHERE tab1.col1 = tab2.col1
+ UNION ALL
+ SELECT tab1.col1, NULL
+ FROM tab1
+ WHERE tab1.col1 NOT IN (SELECT tab2.col1 FROM tab2)
+ ORDER BY col1
+
+
+
+
+
+
+
+
+
+
+
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+
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+
+
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+
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+
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+
+
+
+
+