can any one solve this problem - Mailing list pgsql-sql

<div class="Section1"><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">emp_table(</span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;font-family:Arial">Cdacno varchar (7) (primary key),</span></font><p
class="MsoNormal"style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial">Personal_Novarchar (10)(foreign key),</span></font><p class="MsoNormal"
style="text-indent:.5in"><fontface="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial">Name varchar
(40));</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">personal_table (</span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;font-family:Arial">Personal_No varchar (10) (primary key),</span></font><p
class="MsoNormal"style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial">Cdacnovarchar (7),</span></font><p class="MsoNormal"
style="text-indent:.5in"><fontface="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial">Date_Of_Birth
date);</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">unit_master (</span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;font-family:Arial">Unit id varchar (10) (primary key),</span></font><p
class="MsoNormal"style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial">Unit_Namevarchar(25),</span></font><p class="MsoNormal"
style="text-indent:.5in"><fontface="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial">Unit_Location
varchar(25));</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Unit_Details_table (</span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;font-family:Arial"> Unit_id varchar (foreign key)</span></font><p
class="MsoNormal"style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial">CDA_Novarchar(7) foreign key);</span></font><p class="MsoNormal"><font
face="Arial"size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">rank_table(</span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;font-family:Arial">Rank_ID numeric(2)(primary key),</span></font><p
class="MsoNormal"style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial">Rank_Codenumeric(2),</span></font><p class="MsoNormal"
style="text-indent:.5in"><fontface="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial">Rank_Name varchar
(25));</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Rank_Date_table (</span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;font-family:Arial">  Rank_Date__ID numeric NOT NULL,</span></font><p
class="MsoNormal"style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial"> CDA_No varchar(7) (foreign key),</span></font><p class="MsoNormal"
style="text-indent:.5in"><fontface="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial">  Rank_ID
numeric(2));</span></font><pclass="MsoNormal" style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial"> </span></font><pclass="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">My query is ….if I give cdacno I have to get per_no from personal_table.. With this I have to
displayrank_name from rank_table ,name from emp_table, unit_name from unit_master..</span></font><p
class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Like that if I give per_no I have to get cdacno from emp_table.. .. With this I have to display
rank_namefrom rank_table ,name from emp_table, unit_name from unit_master..</span></font><p class="MsoNormal"><font
face="Arial"size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">And here unit_name is depends on unit_details_table ..and rank_name is depends on rank_date_table..
</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Doing these things first it has to check when we r giving cdacno.. whether  per_no is null or not..
likethis if I give per_no it has to check cdacno is null or not.</span></font><p class="MsoNormal"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Let me know the solution..</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">But I written one function to this to get per_no if I give cdacno………………….</span></font><p
class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal" style="text-indent:.5in"><font face="Arial" size="2"><span
style="font-size:10.0pt;font-family:Arial"> </span></font><pclass="MsoNormal"
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