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556 NULL ÐÞÊηû£¬Ìõ¼þΪÕæ true ½«±ÈÌõ¼þΪ¼Ùfalse
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568 TEXT text ûÓÐÌرðµÄÉÏÏÞÏÞÖÆ£¨½öÊÜÐеÄ×î´ó³¤¶ÈÏÞÖÆ£©
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572 ÔÚϵͳ±íºÍÔÚһЩ´íÎóÐÅÏ¢ÀïÄ㽫¿´µ½ÄÚ²¿Ãû³Æ¡£
574 ÉÏÃæËùÁеÄÇ°ËÄÖÖÀàÐÍÊÇ"varlena"£¨±ä³¤£©ÀàÐÍ£¨Ò²¾ÍÊÇ˵£¬¿ªÍ·µÄËĸö×Ö½ÚÊ
575 dz¤¶È£¬ºóÃæ²ÅÊÇÊý¾Ý£©¡£ ÓÚÊÇʵ¼ÊÕ¼ÓõĿռä±ÈÉùÃ÷µÄ´óСҪ¶àһЩ¡£
576 È»¶øÕâЩÀàÐͶ¼¿ÉÒÔ±»Ñ¹Ëõ´æ´¢£¬Ò²¿ÉÒÔÓà TOAST
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579 VARCHAR(n) ÔÚ´æ´¢ÏÞÖÆÁË×î´ó³¤¶ÈµÄ±ä³¤×Ö·û´®ÊÇ×îºÃµÄ¡£ TEXT
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590 PostgreSQL Ö§³Ö SERIAL
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592 CREATE TABLE person (
598 CREATE SEQUENCE person_id_seq;
599 CREATE TABLE person (
600 id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
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608 Ò»ÖÖ·½·¨ÊÇÔÚ²åÈë֮ǰÏÈÓú¯Êý nextval() ´ÓÐòÁжÔÏóÀï¼ìË÷³öÏÂÒ»¸ö SERIAL
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610 new_id = execute("SELECT nextval('person_id_seq')");
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620 execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
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