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alter table hwsp add column ylxs
ALTER TABLE ±í {ADD ADD{COLUMN ×Ö¶ÎÀàÐÍ [ (×Ö³¤)] [NOT NULL]     [CONSTRAINT Ë÷Òý ] |
     ALTER COLUMN ×Ö¶ÎÀàÐÍ [(×Ö³¤)] |
     CONSTRAINT ¶àÖØ×Ö¶ÎË÷Òý } |
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  declare   @cMd   varchar(1000)  
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MYNUMBER VARCHAR(18)---Éí·ÝÖ¤ºÅÂë
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