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+ * ×Ö·û´®µÄ¿ªÊ¼²¿·Ö±ØÐëÊÇÆÕͨ×Ö·û´®£¬Ò²¾ÍÊÇ˵£º
+ + LIKE ģʽ²»ÄÜÒÔ % ´òÍ·¡£
+ + ~ £¨ÕýÔò±í´ïʽ£©Ä£Ê½±ØÐëÒÔ ^ ´òÍ·¡£
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+ * ´óСдÎ޹صIJéÕÒ£¬Èç ILIKE ºÍ ~* µÈ²»Ê¹ÓÃË÷Òý£¬µ«¿ÉÒÔÓà 4.8
+ ½ÚÃèÊöµÄº¯ÊýË÷Òý¡£
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+ ´óСдÎ޹صĵÈʽ±È½Ïͨ³£Ð´×ö£º
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+ WHERE lower(col) = 'abc';
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+ CREATE INDEX tabindex ON tab (lower(col));
+
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+ SELECT *
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+ SELECT *
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+
+ ÀàÐÍ ÄÚ²¿Ãû³Æ ˵Ã÷
+ VARCHAR(n) varchar
+ Ö¸¶¨ÁË×î´ó³¤¶È£¬±ä³¤×Ö·û´®£¬²»×㶨Ò峤¶ÈµÄ²¿·Ö²»²¹Æë
+ CHAR(n) bpchar ¶¨³¤×Ö·û´®£¬Êµ¼ÊÊý¾Ý²»×㶨Ò峤¶Èʱ£¬ÒÔ¿Õ¸ñ²¹Æë
+ TEXT text ûÓÐÌرðµÄÉÏÏÞÏÞÖÆ£¨½öÊÜÐеÄ×î´ó³¤¶ÈÏÞÖÆ£©
+ BYTEA bytea ±ä³¤×Ö½ÚÐòÁУ¨Ê¹ÓÃNULLÒ²ÊÇÔÊÐíµÄ£©
+ "char" char Ò»¸ö×Ö·û
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+ È»¶øÕâЩÀàÐͶ¼¿ÉÒÔ±»Ñ¹Ëõ´æ´¢£¬Ò²¿ÉÒÔÓà TOAST
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+ VARCHAR(n) ÔÚ´æ´¢ÏÞÖÆÁË×î´ó³¤¶ÈµÄ±ä³¤×Ö·û´®ÊÇ×îºÃµÄ¡£ TEXT
+ ÊÊÓÃÓÚ´æ´¢×î´ó¿É´ï 1G×óÓÒµ«Î´¶¨ÒåÏÞÖƳ¤¶ÈµÄ×Ö·û´®¡£
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+ VARCHAR(n) Ö»´æ´¢Ëù¸ø¶¨µÄÊý¾ÝÄÚÈÝ¡£ BYTEA
+ ÓÃÓÚ´æ´¢¶þ½øÖÆÊý¾Ý£¬ÓÈÆäÊÇ°üº¬ NULL
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+
+ PostgreSQL Ö§³Ö SERIAL
+ Êý¾ÝÀàÐÍ¡£ËüÔÚ×Ö¶ÎÉÏ×Ô¶¯´´½¨Ò»¸öÐòÁкÍË÷Òý¡£ÀýÈ磺
+ CREATE TABLE person (
+ id SERIAL,
+ name TEXT
+ );
+
+ »á×Ô¶¯×ª»»Îª£º
+ CREATE SEQUENCE person_id_seq;
+ CREATE TABLE person (
+ id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
+ name TEXT
+ );
+
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+ Ò»ÖÖ·½·¨ÊÇÔÚ²åÈë֮ǰÏÈÓú¯Êý nextval() ´ÓÐòÁжÔÏóÀï¼ìË÷³öÏÂÒ»¸ö SERIAL
+ Öµ£¬È»ºóÔÙÏÔʽ²åÈ롣ʹÓà 4.11.1 ÀïµÄÀý±í£¬¿ÉÓÃαÂëÕâÑùÃèÊö£º
+ new_id = execute("SELECT nextval('person_id_seq')");
+ execute("INSERT INTO person (id, name) VALUES (new_id, 'Blaise Pascal')");
+
+ ÕâÑù»¹ÄÜÔÚÆäËû²éѯÖÐʹÓôæ·ÅÔÚ new_id ÀïµÄÐÂÖµ£¨ÀýÈ磬×÷Ϊ person
+ ±íµÄÍâ¼ü£©¡£ ×¢Òâ×Ô¶¯´´½¨µÄ SEQUENCE ¶ÔÏóµÄÃû³Æ½«»áÊÇ
+ <table>_<serialcolumn>_seq£¬ ÕâÀï table ºÍ serialcolumn
+ ·Ö±ðÊÇÄãµÄ±íµÄÃû³ÆºÍÄãµÄ SERIAL ×ֶεÄÃû³Æ¡£
+
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+ SERIAL Öµ£¬ÀýÈ磺
+ execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
+ new_id = execute("SELECT currval('person_id_seq')");
+
+ 4.11.3)ʹÓà currval() »áµ¼ÖºÍÆäËûÓû§µÄ³åÍ»Çé¿ö£¨race condition£©Âð£¿
+
+ ²»»á¡£currval() ·µ»ØµÄÊÇÄã±¾´Î»á»°½ø³ÌËù¸³µÄÖµ¶ø²»ÊÇËùÓÐÓû§µÄµ±Ç°Öµ¡£
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+
+ PostgreSQL
+ Àï´´½¨µÄÿһÐмǼ¶¼»á»ñµÃÒ»¸öΨһµÄOID£¬³ý·ÇÔÚ´´½¨±íʱʹÓÃWITHOUT
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+
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+ ¶¯ postmaster ֮ǰÊÔÊÔÏÂÃæµÄÃüÁ
+ ulimit -d 262144
+ limit datasize 256m
+
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+ Í»§¶Ë֮ǰִÐÐÉÏÊöÃüÁî¡£
+
+ 4.14)ÎÒÈçºÎ²ÅÄÜÖªµÀËùÔËÐÐµÄ PostgreSQL µÄ°æ±¾£¿
+
+ ´Ó psql ÀÊäÈë SELECT version();Ö¸Áî¡£
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+ 4.15)ÎÒÈçºÎ´´½¨Ò»¸öȱʡֵÊǵ±Ç°Ê±¼äµÄ×ֶΣ¿
+
+ ʹÓà CURRENT_TIMESTAMP£º
+ CREATE TABLE test (x int, modtime TIMESTAMP DEFAULT CURRENT_TIMESTAMP );
+
+ 4.16)ÎÒÔõÑù½øÐÐ outer join £¨ÍâÁ¬½Ó£©£¿
+
+ PostgreSQL ²ÉÓñê×¼µÄ SQL Óï·¨Ö§³ÖÍâÁ¬½Ó¡£ÕâÀïÊÇÁ½¸öÀý×Ó£º
+ SELECT *
+ FROM t1 LEFT OUTER JOIN t2 ON (t1.col = t2.col);
+
+ »òÊÇ
+ SELECT *
+ FROM t1 LEFT OUTER JOIN t2 USING (col);
+
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+ JOIN)½«·µ»Ø t2 ÖÐδÁ¬½ÓµÄÐС£ ÍêÈ«ÍâÁ¬½Ó£¨FULL OUTER JOIN£©½«·µ»Ø t1
+ ºÍ t2 ÖÐδÁ¬½ÓµÄÐС£ ¹Ø¼ü×Ö OUTER
+ ÔÚ×ó[Íâ]Á¬½Ó¡¢ÓÒ[Íâ]Á¬½ÓºÍÍêÈ«[Íâ]Á¬½ÓÖÐÊÇ¿ÉÑ¡µÄ£¬ÆÕͨÁ¬½Ó±»³ÆΪÄÚÁ¬½Ó
+ £¨INNER JOIN£©¡£
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+
+ ûÓа취²éѯµ±Ç°Êý¾Ý¿âÖ®ÍâµÄÊý¾Ý¿â¡£ ÒòΪ PostgreSQL
+ Òª¼ÓÔØÓëÊý¾Ý¿âÏà¹ØµÄϵͳĿ¼£¨ÏµÍ³±í£©£¬Òò´Ë¿çÊý¾Ý¿âµÄ²éѯÈçºÎÖ´ÐÐÊDz»
+ ¶¨µÄ¡£
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+ http://techdocs.postgresql.org/guides/SetReturningFunctions
+
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+ ¶Á/SELECT²éѯµÄÉêÇ룬 Ä¿Ç°×îÁ÷ÐÐÇÒÊÇÃâ·ÑµÄÖ÷/´Ó PostgreSQL¸´ÖÆ·½°¸ÊÇ
+ Slony-I ¡£
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