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? create table zgda3.dbf (±àºÅ c(6) not null primary key,ÐÕÃû c(6),ÄêÁä n(2,0),¹¤×Ê f(6,2)) ? create table zgda3.dbf (±àºÅ c(6),ÐÕÃû c(6),ÄêÁä n(2,0) check ÄêÁä>0 error \ÄêÁäÒª´óÓÚ

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? create table zgda4 free (±àºÅ c(6),ÐÕÃû c(6),ÄêÁä n(2,0)) &&zgda4ÊÇ×ÔÓɱí ×¢Ò⣺£¨±ízgda1----zgda4ÊÇÊý¾Ý¿â±í£¬²¢×Ô¶¯¼Óµ½µ±Ç°Êý¾Ý¿âSQLLXÖУ© (1) c n fÀàÐÍÐèÒªÖ¸¶¨¿í¶È n f bÀàÐÍÒªÖ¸¶¨¾«¶È (2)UNIQUE ºòÑ¡Ë÷Òý primary key Ö÷Ë÷Òý 2¡¢alter table Ð޸ıí½á¹¹

alter table zgda3 add column ÐÔ±ð c(2) check ÐÔ±ð=\Å®\ÐÔ±ð=\ÄÐ\ÐÔ±ðÖ»ÄÜΪÄлòÕßÅ®\ÄÐ\

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alter table zgda3 alter column ÐÔ±ð c(4) check ÐÔ±ð=\Å®\ÐÔ±ð=\ÄÐ\ÐÔ±ðÖ»ÄÜΪÄлòÕßÅ®\Å®\

alter table zgda3 alter column ÐÔ±ð drop default &&ɾ³ýÐÔ±ð×ֶεÄ

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alter table zgda3 alter column ÐÔ±ð drop check &&ɾ³ýÐÔ±ð×ֶεÄÓÐЧÐÔ¹æÔò

alter table zgda3 alter column ÐÔ±ð set check ÐÔ±ð=\ÄÐ\ÐÔ±ð=\Å®\ÄлòÅ®?\alter table zgda3 alter column ÐÔ±ð set default \ÄÐ\ &&ÉèÖûò¸ü¸ÄÐÔ±ð×ֶεÄĬÈÏÖµ

alter table zgda3 drop column ÐÔ±ð &&ɾ³ýÐÔ±ð×ֶΠalter table zgda3 rename ÐÕÃû to name &&ÐÕÃû×ֶθÄÃûΪname

alter table zgda3 rename column name to NM

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create table zgda4.dbf (±àºÅ c(6),ÐÕÃû c(6),ÄêÁä n(2,0),³öÉúÈÕÆÚ d,»é·ñ L)

insert into zgda4(±àºÅ,ÐÕÃû,ÄêÁä,³öÉúÈÕÆÚ,»é·ñ) values (\ÕÅÈý\

insert into zgda4(±àºÅ,ÐÕÃû,ÄêÁä,³öÉúÈÕÆÚ,»é·ñ) values(\ÀîËÄ\

insert into zgda4(±àºÅ,ÐÕÃû,ÄêÁä,³öÉúÈÕÆÚ,»é·ñ) values(\ÍõÎå\5¡¢delete

dele from zgda4 where ÄêÁä>=40 &&ÓÃlistÃüÁîÏÔʾ¼Ç¼£¬¿É¿´µ½2Ìõ¼Ç¼¼ÓÉÏÁËɾ³ý±ê¼Ç¡£ 6¡¢update

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select all Ö°³Æ from zgda &&all¿ÉÊ¡ÂÔ£¬²é³öËùÓмǼµÄÖ°³Æ×Ö¶ÎÖµ select distinct Ö°³Æ from zgda &&²é³öËùÓмǼµÄÖ°³Æ×Ö¶ÎÖµ£¬È¥µôÖظ´ÐС£ select ÐÕÃû,ÐÔ±ð,ÄêÁä,Ö°³Æ from zgda

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