--1.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);

--2.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);

 --3.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)

 --4.Check约束

 SELECT

  tab.name AS [表名],

  chk.name AS [Check约束名],

  col.name AS [列名],

  chk.definition

FROM

  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)