How to filter the result by using a Quarter fields

Question

How can i fiter the output by using the quarter field for example I want to display the output for letting date 07060801 and quarter 1(Q1-2007) thanks
SELECT tab.description, tab.itmenum, tab.units, tab.countyname, tab.datelet,'Q'||tab.Quarter,
       tab.contid, tab.vendor, tab.vendorname, tab.quantity, tab.EngineersPrice ,
        (tab.EngineersPrice*tab.quantity) EngineersTotal, tab.vendorsPrice,
       (tab.quantity * tab.vendorsPrice) VendorsTotal
  FROM (SELECT   INITCAP (i.idescrl || '  ' || e.isupdes) description,
                 e.isupdes, i.idescrl, SUBSTR (e.eiitem, 1, 4)|| '.'|| SUBSTR (e.eiitem, 5, 9) itmenum,
                 e.eiitem, func_get_unit_name (iunits) units,
                 INITCAP (func_get_county_name (p.ccnty1)) countyname,
                 b.datelet,TO_CHAR(b.datelet, 'Q-YYYY') Quarter, p.contid, d.vendor, l.CALL, g.csecnum, e.iplineno,                         
                 SUM (e.iqty) quantity,
                 (TRIM (d.vendor) || ' : ' || INITCAP (v.vnamel)) vendorname,
                       (SELECT br.bidprice
                    FROM bidtabs br
                         --------------------Select Letting Dates-------------------------------
                   WHERE br.letting  between '&lettingDatePlease' and  '&lettingDatePlease2'
                     AND br.lineflag = 'L'                                   
                     AND br.iplineno = e.iplineno
                     AND br.CALL = l.CALL
                     AND br.vendor = d.vendor) vendorsPrice,
                     (SELECT DISTINCT pi.price
                             FROM propitem pi
                            WHERE pi.contid = p.contid
                                     AND pi.lineflag='L'
                                     AND trim(pi.iplineno) <> ' '
                              AND trim(pi.iplineno) = trim(e.iplineno)) EngineersPrice
            FROM itemlist i,
                 estitem e,
                 estcatg g,
                 propproj x,
                 proposal p,
                 letprop l,
                 bidlet b,
                 bidders d,
                 vendor v
           WHERE p.contid = x.contid
             AND x.pcn = g.pcn
             AND e.pcn = g.pcn
             AND e.cn = g.cn
             AND i.item = e.eiitem
             AND i.ispecyr = p.cspecyr
             AND e.iplineno <> ' '
             AND e.eiitem <> '2550601/01000'
             AND e.eiitem <> '2565601/00031'
             AND e.eiitem <> '2565601/00033'
             AND e.eiitem <> '2402601/01000'
                -----Select Item Number----------
             AND e.eiitem = '&itemNumberPlease'
             AND l.lcontid = p.contid
             AND l.letting = b.letting
             AND l.letting = d.letting
             AND l.CALL = d.CALL
               -- AND l.LETSTAT='A'---------------------why 6/22 is not included----------------------------work with this-------------------------
             AND d.vendor = v.vendor
                ------Select Letting Dates--------
             AND b.letting between '&lettingDatePlease' and  '&lettingDatePlease2'
        GROUP BY p.contid,
                       d.vendor,
                 g.csecnum,
                 e.iplineno,
                 SUBSTR (e.eiitem, 1, 4) || '.' || SUBSTR (e.eiitem, 5, 9),
                 b.datelet,
                 l.CALL,
                 e.eiitem,
                 (i.idescrl || '  ' || e.isupdes),
                 func_get_unit_name (iunits),                
                 iunits,
                 p.ccnty1,
                 i.idescrl,
                 e.isupdes,
                 i.idescrl,
                 v.vnamel,
                 e.isupdes)  tab
DESCRIPTION     ITMENUM     UNITS     COUNTYNAME     DATELET     'Q'||TAB.QUARTER     CONTID     VENDOR     VENDORNAME     QUANTITY     ENGINEERSPRICE     ENGINEERSTOTAL     VENDORSPRICE     VENDORSTOTAL
Mobilization        2021.501/00010     LUMP SUM     Hennepin     3/30/2007     Q1-2007     060048              ALS0010            ALS0010 : Ames / Lunda / Shafer (Jv)     1     11376150     11376150     14357900     14357900
Mobilization        2021.501/00010     LUMP SUM     Hennepin     3/30/2007     Q1-2007     060048              MP0001             MP0001 : Mccrossan/Pcl (Jv)     1     11376150     11376150     15600000     15600000
Mobilization        2021.501/00010     LUMP SUM     Wright     5/18/2007     Q2-2007     070002              C320               C320 : Central Specialties Inc     1     130459     130459     637860     637860
Mobilization        2021.501/00010     LUMP SUM     Wright     5/18/2007     Q2-2007     070002              D420               D420 : Duininck Brothers Inc     1     130459     130459     362000     362000
Mobilization        2021.501/00010     LUMP SUM     Wright     5/18/2007     Q2-2007     070002              H151               H151 : Hardrives Inc     1     130459     130459     516000     516000
Mobilization        2021.501/00010     LUMP SUM     Wright     5/18/2007     Q2-2007     070002              H438               H438 : Hoffman Construction Company     1     130459     130459     255000     255000
Mobilization        2021.501/00010     LUMP SUM     Wright     5/18/2007     Q2-2007     070002              K0037              K0037 : Knife River Corporation - North Central     1     130459     130459     290953.37     290953.37
Mobilization        2021.501/00010     LUMP SUM     Wright     5/18/2007     Q2-2007     070002              M0027              M0027 : Midwest Contracting Llc     1     130459     130459     285000     285000

Answer 1

Hi gourous,
I am sorry, my question is a little bit more complex. I hope I may repost here, without opening another thread. Thank you for your understanding.
The EQUIPE_ID column of the table refers to a team. This id is returned by a select list named :P60_EQUIPE_ID which select all the EQUIPE_ID available. Then if one choose a team in this select list, the choosen EQUIPE_ID is returned. If nothing is selected in the select list, then a null value is returned.
The AGENT_ID refers to a person. This id is returned by a select list named :P60_AGENT_ID, which returns all the members of the previously selected EQUIPE_ID. If nothing is selected, then a null value is returned.
A team may have several persons belonging to that team.
I would like that if a TEAM is selected, without selecting an agent in the :P60_AGENT_ID select list (returning a null value in this case), then all the people belonging to that theam will be retrieved by the select QUERY of a report.
Then one could refine the query by selecting a person in the :P60_AGENT_ID select list in order to view only the people of that team in the report.
To resume :
IF EQUIPE_ID is NULL -> all the teams and all the persons are displayed in the report.
IF EQUIPE_ID is NOT NULL and :P60_AGENT_ID is NULL -> All the people of that selected team appears on the report
IF EQUIPE_ID is NOT NULL and :P60_AGENT_ID is NOT NULL -> The report displays only the results of the query for that person of that team.
Thank you for your kind help !