SQL statement to view the basic table structure and constraint fields, primary codes and foreign codes in the table (simple and effective)

①exec sp_helpconstraint ‘ Table name ’： You can query various constraint attributes in the table （ Field ）, Including the ability to view which field in the table is foreign code 、 Main code 、 The scope of the property

②sp_help + Table name or sp_columns + Table name ： View elements and basic structure in the table

③ To query the data inserted in the basic table, you can use ：
select * from table
and select * from table t where t.id=(select last_insert_id()) You can rely on the key code to query a single specific data , Here t.id It's a watch t The main code in （ Because the query is completed by the main code ）,t.id Followed by the corresponding main code value in the inserted data .