List all table constraints (PK, UK, FK, Check & Default) in Azure SQL Database

Article for: SQL Server Teradata

The query below lists all table (and view) constraints - primary keys, unique key constraints and indexes, foreign keys and check and default constraints.

Query

select table_view,
    object_type,
    constraint_type,
    constraint_name,
    details
from (
    select schema_name(t.schema_id) + '.' + t.[name] as table_view,
        case when t.[type] = 'U' then 'Table'
            when t.[type] = 'V' then 'View'
            end as [object_type],
        case when c.[type] = 'PK' then 'Primary key'
            when c.[type] = 'UQ' then 'Unique constraint'
            when i.[type] = 1 then 'Unique clustered index'
            when i.type = 2 then 'Unique index'
            end as constraint_type,
        isnull(c.[name], i.[name]) as constraint_name,
        substring(column_names, 1, len(column_names)-1) as [details]
    from sys.objects as t
        left outer join sys.indexes as i
            on t.object_id = i.object_id
        left outer join sys.key_constraints as c
            on i.object_id = c.parent_object_id
            and i.index_id = c.unique_index_id
       cross apply (select col.[name] + ', '
                        from sys.index_columns as ic
                            inner join sys.columns as col
                                on ic.object_id = col.object_id
                                and ic.column_id = col.column_id
                        where ic.object_id = t.object_id
                            and ic.index_id = i.index_id
                                order by col.column_id
                                for xml path ('') ) as D (column_names)
    where is_unique = 1
    and t.is_ms_shipped <> 1
    union all
    select schema_name(fk_tab.schema_id) + '.' + fk_tab.name as foreign_table,
        'Table',
        'Foreign key',
        fk.name as fk_constraint_name,
        schema_name(pk_tab.schema_id) + '.' + pk_tab.name
    from sys.foreign_keys as fk
        inner join sys.tables as fk_tab
            on fk_tab.object_id = fk.parent_object_id
        inner join sys.tables as pk_tab
            on pk_tab.object_id = fk.referenced_object_id
        inner join sys.foreign_key_columns as fk_cols
            on fk_cols.constraint_object_id = fk.object_id
    union all
    select schema_name(t.schema_id) + '.' + t.[name],
        'Table',
        'Check constraint',
        con.[name] as constraint_name,
        con.[definition]
    from sys.check_constraints as con
        left outer join sys.objects as t
            on con.parent_object_id = t.object_id
        left outer join sys.all_columns as col
            on con.parent_column_id = col.column_id
            and con.parent_object_id = col.object_id
    union all
    select schema_name(t.schema_id) + '.' + t.[name],
        'Table',
        'Default constraint',
        con.[name],
        col.[name] + ' = ' + con.[definition]
    from sys.default_constraints as con
        left outer join sys.objects as t
            on con.parent_object_id = t.object_id
        left outer join sys.all_columns as col
            on con.parent_column_id = col.column_id
            and con.parent_object_id = col.object_id) as a
order by table_view, constraint_type, constraint_name

Columns

  • table_view - table or view schema and name
  • object_type - object type:
    • Table
    • View
  • constraint_type - type of constraint:
    • Primary key
    • Unique key
    • Foreign key
    • Check constraint
    • Default constraint
  • constraint_name - name of constraint or index
  • details - details of this constraint:
    • Primary key - PK column(s)
    • Unique key - UK column(s)
    • Foreign key - parent table name
    • Check constraint - check definition
    • Default constraint - column name and default value definition

Rows

  • One row: represents one constraint: PK, UK, FK, Check, Default
  • Scope of rows: all constraints
  • Ordered by: schema, table name, constraint type

Sample results

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