$9$Write the relational algebra expression to list the code and name of vendors who supplied

no products.

Table Line:

$\backslash$table$[[$invoicenumber$,$linenumber,productcode,quantity,unitprice$],[1001,1,13-Q\frac{2}{P}2,1,14\mathrm{.}99],[1001,2,23109-HB,1,9\mathrm{.}95],[1002,1,54778-2T,2,4\mathrm{.}99],[1003,1,\frac{2238}{Q}PD,1,38\mathrm{.}95],[1003,2,1546-QQ2,1,39\mathrm{.}95],[1003,3,13-Q\frac{2}{?}$ P$,5,14\mathrm{.}99],[1004,1,54778-2T,3,4\mathrm{.}99],[1004,2,23109-HB,2,9\mathrm{.}95],[1005,1,$PVC$23$DRT$,12,5\mathrm{.}87],[1006,1,$SM$-18277,3,6\mathrm{.}99],[1006,2,\frac{2232}{Q}TY,1,109\mathrm{.}92],[1006,3,23109-$ HB$,1,9\mathrm{.}95],[1006,4,89-$ WRE$-$Q$,1,256\mathrm{.}99]]$

Table Product:

$\backslash$table$[[$productcode$,$description,indate,quantityonhand,minquantityonhand,price,discountrate,vendorcode$],[11$QER$/31,$Power painter, $15$ psi.,,$\frac{11}{3}\frac{?}{2012},8,5,109\mathrm{.}99,0,25595],[13-Q\frac{2}{P}2,7\mathrm{.}25-$cm$.$ pwr$.$ saw blad,$\frac{12}{13}\frac{?}{2012},32,15,14\mathrm{.}99,0\mathrm{.}05,21344],[14-$Q$1/$L$3,9\mathrm{.}00-$cm$.$ pwr$.$ saw blad,$\frac{11}{13}\frac{?}{2012},18,12,17\mathrm{.}49,0,21344],[1546-$QQ$2,$Hrd$.$ cloth, $1/4-$cm$.,2x^5,\frac{1}{15}\frac{?}{2013},15,8,39\mathrm{.}95,0,23119],[1558-$QW$1,$Hrd$.$ cloth, $\frac{1}{2}-c{m}_{.},3x^5,\frac{1}{15}\frac{?}{2013},23,5,43\mathrm{.}99,0,23119],[2232/$QTY$,\frac{B}{\frac{?}{?}}$&$D$ jigsaw, $12-$cm$.$ bli,$\frac{12}{30}\frac{?}{2012},8,5,109\mathrm{.}92,0\mathrm{.}05,24288],[2232/$QWE$,\frac{B}{\frac{?}{?}}$&$D$ jigsaw, $8-$cm$.$ blat,$\frac{12}{24}\frac{?}{2012},6,5,99\mathrm{.}87,0\mathrm{.}05,24288],[2238/$QPD$,\frac{B}{\frac{?}{?}}$&$D$ cordless drill, $\frac{1}{2},\frac{1}{20}\frac{?}{2012},12,5,38\mathrm{.}95,0\mathrm{.}05,25595],[23109-$HB$,$Claw hammer,$\frac{1}{20}\frac{?}{2012},23,10,9\mathrm{.}95,0\mathrm{.}1,21225],[23114-$AA$,$Sledge hammer, $6kg.,\frac{1}{2}\frac{?}{2012},8,5,14\mathrm{.}4,0\mathrm{.}05,$NULL$],[54778-2T,$Rat$-$tail file, $\frac{1}{8}-cm.$ fin,$\frac{12}{15}\frac{?}{2013},43,20,4\mathrm{.}99,0,21344],[89-$WRE$-$Q$,$Hicut chain saw, $16cm.,\frac{2}{7}\frac{?}{2013},11,5,256\mathrm{.}99,0\mathrm{.}05,24288],[$PVC$23$DRT$,$PVC pipe, $3\mathrm{.}5-$cm$.,2m,\frac{2}{20}\frac{?}{2013},188,75,5\mathrm{.}87,0,$NULL$],[$SM$-18277,1\mathrm{.}25-$cm$.$ metal screw,,$\frac{3}{1}\frac{?}{2013},172,75,6\mathrm{.}99,0,21225],[$SW$-23116,2\mathrm{.}5-$cm$.$ wd$.$ screw, $50,\frac{2}{24}\frac{?}{2013},237,100,8\mathrm{.}45,0,21231],[$WR$3/$TT$3,$Steel matting, $48\frac{1}{6}c,\frac{1}{17}\frac{?}{2013},18,5,119\mathrm{.}95,0\mathrm{.}1,25595]]$

Table Vendor:

$\backslash$table$[[$vendorcode$,$name,contactperson,areacode,phone,country,previousorder$],[21225,$Bryson, Inc.,Smithson,$181,223-3234,$UK$,$Y$],[21226,$SuperLoo, Inc.,Flushing,$113,215-8995,$SA$,N$