Using the schema, tables, and data you created in Exercise 1 (The picture below):

Examine the candidate keys in each table.

Write ALTER TABLE statements for each table to create Primary Keys and Foreign Keys where applicable.

Test the statements in your schema to make sure they work.

Tables Customer ?len columns ? CUSCODE ? CUS-LNAME - CUS FNAME ? CUS-INITIAL ? CUS-AREACODE ? CUS-PHONE ? CUS-BALANCE Indexes Foreign Keys Triggers ?| | invoice ?len columns ? INVNUMBER ? CUSCODE ? INVDATE ? INVSUBTOTAL - - - - INV TAX ? INV TOTAL Indexes Foreign Keys Triggers ?- | line Columns ? INVNUMBER ? LINENUMBER ? PCODE ? LINEUNITS ? LINEPRICE ? LINE TOTAL Indexes Foreign Keys Triggers - - - - - ? product ?len columns ? PCODE ? PDESCRIPT ? P. INDATE ? P.Q0H ? PMIN ? PPRICE ? PDISCOUNT ? V-CODE Indexes Foreign Keys Triggers - - - - - vendo ? Columns ? VCODE ? V-NAME ? VCONTACT ? VAREACODE ? V PHONE - - - V STATE ? VORDER Indexes Foreign Keys Triggers