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+Êǵġ£Óм¸¸öÊÊÓÃÓÚ PostgreSQL µÄͼÐνӿڡ£°üÀ¨PgAccess£¨http:\r
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+ * C (libpq)\r
+ * Embedded C (ecpg)\r
+ * Java (jdbc)\r
+ * Python (PyGreSQL)\r
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+ CREATE INDEX tabindex ON tab (lower(col));\r
+\r
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+ 4.13) ÔÚÒ»¸ö²éѯÀÎÒÔõÑù¼ì²âÒ»¸ö×Ö¶ÎÊÇ·ñΪ NULL£¿\r
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+ ÀàÐÍ ÄÚ²¿Ãû³Æ ˵Ã÷\r
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+ CREATE TABLE person ( \r
+ id SERIAL, \r
+ name TEXT \r
+ );\r
+\r
+»á×Ô¶¯×ª»»Îª£º \r
+ \r
+ CREATE SEQUENCE person_id_seq;\r
+ CREATE TABLE person ( \r
+ id INT4 NOT NULL DEFAULT nextval('person_id_seq'),\r
+ name TEXT \r
+ );\r
+ CREATE UNIQUE INDEX person_id_key ON person ( id );\r
+\r
+²Î¿¼ create_sequence ÊÖ²áÒ³»ñÈ¡¹ØÓÚÐòÁеĸü¶àÐÅÏ¢¡£Ä㻹¿ÉÒÔÓÃÿÐÐµÄ oid\r
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+µÄ -o Ñ¡Ïî»òÕß COPY WITH OIDS Ñ¡ÏîÒÔ±£Áô OID¡£ \r
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+\r
+ new_id = execute("SELECT nextval('person_id_seq')");\r
+ execute("INSERT INTO person (id, name) VALUES (new_id, 'Blaise\r
+Pascal')");\r
+\r
+ÕâÑù»¹ÄÜÔÚÆäËû²éѯÖÐʹÓôæ·ÅÔÚ new_id ÀïµÄÐÂÖµ£¨ÀýÈ磬×÷Ϊ person ±íµÄÍâ\r
+¼ü£©¡£×¢Òâ×Ô¶¯´´½¨µÄ SEQUENCE ¶ÔÏóµÄÃû³Æ½«»áÊÇ\r
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+SERIAL Öµ£¬ÀýÈ磬 \r
+\r
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+ new_id = execute("SELECT currval('person_id_seq')");\r
+\r
+×îºó£¬Äã¿ÉÒÔʹÓÃ´Ó INSERT Óï¾ä·µ»ØµÄ OID <4.16> ²éÕÒȱʡֵ£¬¾¡¹ÜÕâ¿ÉÄÜÊÇ\r
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+ CREATE TABLE new(old_oid oid, mycol int);\r
+ SELECT old_oid, mycol INTO new FROM old;\r
+ COPY new TO '/tmp/pgtable';\r
+ DELETE FROM new;\r
+ COPY new WITH OIDS FROM '/tmp/pgtable';\r
+\r
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+ 4.17) PostgreSQL ʹÓõÄһЩÊõÓïµÄº¬ÒåÊÇʲô£¿\r
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+ table, relation, class \r
+ row, record, tuple \r
+ column, field, attribute \r
+ retrieve, select \r
+ replace, update \r
+ append, insert \r
+ OID, serial value \r
+ portal, cursor \r
+ range variable, table name, table alias \r
+\r
+ÓÐÒ»¸öͨÓÃÊý¾Ý¿âÊõÓïµÄÁÐ±í£ºhttp://hea-\r
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+ 4.18) ΪʲôÎÒÊÕµ½´íÎó¡°/ERROR: Memory exhausted in\r
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+postmaster ֮ǰÊÔÊÔÏÂÃæµÄÃüÁ \r
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+ ulimit -d 262144\r
+ limit datasize 256m\r
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+´Ó psql À¼üÈë SELECT version()£»\r
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+ʹÓà CURRENT_TIMESTAMP£º\r
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+ 4.22) ΪʲôʹÓà IN µÄ×Ó²éѯÕâôÂý£¿\r
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+ SELECT *\r
+ FROM t1 LEFT OUTER JOIN t2 ON (t1.col = t2.col);\r
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+»ò \r
+ SELECT *\r
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+ SELECT tab1.col1, tab2.col2\r
+ FROM tab1, tab2\r
+ WHERE tab1.col1 = tab2.col1\r
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+ UNION ALL\r
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+ SELECT tab1.col1, NULL\r
+ FROM tab1\r
+ WHERE tab1.col1 NOT IN (SELECT tab2.col1 FROM tab2)\r
+ ORDER BY col1\r
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+http://www.PostgreSQL.org/idocs/index.php?plpgsql-cursors.html\r
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+http://gborg.PostgreSQL.org/project/pgreplication/projdisplay.php\r
+ ÕýÔÚ\r
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+contrib/pgcrypto °üº¬Á˺ܶàÔÚ SQL ²éѯÖÐʹÓõļÓÃܺ¯Êý¡£¼ÓÃÜ¿Í»§¶Ëµ½·þÎñ\r
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projects / postgresql.git / commitdiff