Lists the columns in two tables or views that are likely join candidates.
sp_helpjoins lefttab, righttab
is the first table or view.
is the second table or view. The order of the parameters does not matter.
Displays a list of columns that are likely join candidates in the sales and salesdetail tables:
sp_helpjoins sales, salesdetail
a1 a2 b1 b2 c1 c2 d1 d2 e1 e2 f1 f2 g1 g2 h1 h2 -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- stor_id stor_id ord_num ord_num NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL
Displays a list of columns that are likely join candidates in the sysobjects and syscolumns system tables:
sp_helpjoins sysobjects, syscolumns
a1 a2 b1 b2 c1 c2 d1 d2 e1 e2 f1 f2 g1 g2 h1 h2 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- id id NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL
The column pairs that sp_helpjoins displays come from either of two sources. sp_helpjoins checks the syskeys table in the current database to see if any foreign keys have been defined with sp_foreignkey on the two tables, then checks to see if any common keys have been defined with sp_commonkey on the two tables. If sp_helpjoins does not find any foreign keys or common keys there, it checks for keys with the same user-defined datatypes. If that fails, it checks for columns with the same name and datatype.
sp_helpjoins does not create any joins.
Any user can execute sp_helpjoins.
System procedures sp_commonkey, sp_foreignkey, sp_helpkey, sp_primarykey
