主键约束SELECT  tab.name AS [表名],  idx.name AS [主键名称],  col.name AS [主键列名]FROM  sys.indexes idx    JOIN sys.index_columns idxCol       ON (idx.object_id = idxCol.object_id           AND idx.index_id = idxCol.index_id           AND idx.is_primary_key = 1)    JOIN sys.tables tab      ON (idx.object_id = tab.object_id)    JOIN sys.columns col      ON (idx.object_id = col.object_id          AND idxCol.column_id = col.column_id); 唯一约束SELECT  tab.name AS [表名],  idx.name AS [约束名称],  col.name AS [约束列名]FROM  sys.indexes idx    JOIN sys.index_columns idxCol       ON (idx.object_id = idxCol.object_id           AND idx.index_id = idxCol.index_id           AND idx.is_unique_constraint = 1)    JOIN sys.tables tab      ON (idx.object_id = tab.object_id)    JOIN sys.columns col      ON (idx.object_id = col.object_id          AND idxCol.column_id = col.column_id); 外键约束select  oSub.name  AS  [子表名称],  fk.name AS  [外键名称],  SubCol.name AS [子表列名],  oMain.name  AS  [主表名称],  MainCol.name AS [主表列名]from  sys.foreign_keys fk      JOIN sys.all_objects oSub          ON (fk.parent_object_id = oSub.object_id)    JOIN sys.all_objects oMain         ON (fk.referenced_object_id = oMain.object_id)    JOIN sys.foreign_key_columns fkCols         ON (fk.object_id = fkCols.constraint_object_id)    JOIN sys.columns SubCol         ON (oSub.object_id = SubCol.object_id              AND fkCols.parent_column_id = SubCol.column_id)    JOIN sys.columns MainCol         ON (oMain.object_id = MainCol.object_id              AND fkCols.referenced_column_id = MainCol.column_id) Check约束SELECT  tab.name AS [表名],  chk.name AS [Check约束名],  col.name AS [列名],  chk.definitionFROM  sys.check_constraints chk    JOIN sys.tables tab      ON (chk.parent_object_id = tab.object_id)    JOIN sys.columns col      ON (chk.parent_object_id = col.object_id          AND chk.parent_column_id = col.column_id)