<p align="LEFT"><font color="#000000" face="Arial" size="2">I have plpgsql function</font><font color="#000000"
face="Arial"size="2"> that</font><font color="#000000" face="Arial" size="2"> updates the table and</font> <font
color="#000000"face="Arial" size="2">may have (and also may not have)</font><font color="#000000" face="Arial"
size="2">null</font><font color="#000000" face="Arial" size="2"></font> <font color="#000000" face="Arial"
size="2">parameters</font><fontcolor="#000000" face="Arial" size="2">:</font><p align="LEFT"><font color="#000000"
face="Arial"size="2">create function f_test(int4, int4) returns int4 as</font><p align="LEFT"><font color="#000000"
face="Arial"size="2">'</font><p align="LEFT"><font color="#000000" face="Arial" size="2"> declare</font><ul><ul><p
align="LEFT"><fontcolor="#000000" face="Arial" size="2">v1 alias for $1;</font></ul></ul><p align="LEFT"> <font
color="#000000"face="Arial" size="2">v2 alias for $2;</font><p align="LEFT"> <font color="#000000" face="Arial"
size="2">v3int4;</font><p align="LEFT"><font color="#000000" face="Arial" size="2"> begin</font><p
align="LEFT"> <font color="#000000" face="Arial" size="2">raise notice ''v1 = %'', v1;</font><p
align="LEFT"> <font color="#000000" face="Arial" size="2">update _</font><font color="#000000" face="Arial"
size="2">testtable</font><fontcolor="#000000" face="Arial" size="2"> set</font> <font color="#000000" face="Arial"
size="2">a</font><fontcolor="#000000" face="Arial" size="2"> = v1 where</font> <font color="#000000" face="Arial"
size="2">b</font><fontcolor="#000000" face="Arial" size="2"> = v2;</font><p align="LEFT"> <font color="#000000"
face="Arial"size="2">select into v3</font> <font color="#000000" face="Arial" size="2">a</font><font color="#000000"
face="Arial"size="2"> from _</font><font color="#000000" face="Arial" size="2">testtable</font><font color="#000000"
face="Arial"size="2"> where</font> <font color="#000000" face="Arial" size="2">b</font><font color="#000000"
face="Arial"size="2"> = v2;</font><p align="LEFT"> <font color="#000000" face="Arial" size="2">raise notice ''v3
=%'', v3;</font><p align="LEFT"> <font color="#000000" face="Arial" size="2">return v3;</font><p
align="LEFT"><fontcolor="#000000" face="Arial" size="2"> end;</font><p align="LEFT"><font color="#000000"
face="Arial"size="2">' language 'plpgsql';</font><p align="LEFT"><font color="#000000" face="Arial"
size="2">C</font><fontcolor="#000000" face="Arial" size="2">olumn a</font> <font color="#000000" face="Arial"
size="2">in_</font><i><font color="#000000" face="Arial" size="2">testable</font></i><i> <font color="#000000"
face="Arial"size="2">can have null value</font></i><i><font color="#000000" face="Arial" size="2">. When I
do</font></i><i><font color="#000000" face="Arial" size="2">‘</font></i><i><font color="#000000" face="Arial"
size="2">sele</font></i><i><fontcolor="#000000" face="Arial" size="2">ct</font></i><i> <font color="#000000"
face="Arial"size="2">f</font></i><font color="#000000" face="Arial" size="2">_test(</font><font color="#000000"
face="Arial"size="2">1,</font><font color="#000000" face="Arial" size="2">1</font><font color="#000000" face="Arial"
size="2">)</font><fontcolor="#000000" face="Arial" size="2">;’</font><font color="#000000" face="Arial" size="2"> then
everythingis working fine. The row is updated</font><font color="#000000" face="Arial" size="2"> (v1</font><font
color="#000000"face="Arial" size="2"> = v3 = 1</font><font color="#000000" face="Arial" size="2">)</font><font
color="#000000"face="Arial" size="2">.</font><p align="LEFT"><font color="#000000" face="Arial" size="2">But when I do
‘selectf_test(</font><font color="#000000" face="Arial" size="2">null,1);’</font><font color="#000000" face="Arial"
size="2">nothing happens</font> <font face="Wingdings" size="2">L</font><font color="#000000" face="Arial" size="2">.
Noerrors reported, but ‘select a from _</font><font color="#000000" face="Arial" size="2">testable</font><font
color="#000000"face="Arial" size="2"> where</font><font color="#000000" face="Arial" size="2"></font> <font
color="#000000"face="Arial" size="2">b=1;’ returns 1</font><font color="#000000" face="Arial" size="2"> (v1 = v3 =
<null>)</font><fontcolor="#000000" face="Arial" size="2">.</font><p align="LEFT"><font color="#000000"
face="Arial"size="2">Where am I wrong?</font><p><b><font face="Arial Cyr" size="2">CONFIDENTIALITY NOTICE</font></b><br
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