sqlsever2008实验二指导书及答案
(3)altertableteacheraddteasexchar(2)nullconstraintteasex_ckcheck(teasexin('男','女'))(4)altertablecla_teaaddconstraintclaid_fkforiegnkey(claid)referencesclass(claid)altertablecla_teaaddconstraintteaid_fkforiegnkey(teaid)referencesteacher(teaid)
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