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<section class="normal" id="section-">
<h1 id="subquery">Subquery</h1>
<blockquote>
<p>코드에서 사용되는 데이터 파일 내용은 페이지 아래쪽에 있습니다. </p>
</blockquote>
<p>Subquery 는 <code>if ( idx in array )</code> 를 이용하여 구현할 수 있습니다.</p>
<pre><code class="lang-bash"><span class="hljs-comment">##################### SQL 문 #######################</span>
SELECT ord_num, ord_amount, ord_date, cust_code, agent_code
FROM orders
WHERE agent_code IN (
SELECT agent_code FROM agents
WHERE working_area=<span class="hljs-string">'Bangalore'</span>);
ORD_NUM ORD_AMOUNT ORD_DATE CUST_CODE AGENT_CODE
---------- ---------- --------- ---------- ----------
<span class="hljs-number">200130</span> <span class="hljs-number">2500</span> <span class="hljs-number">30</span>-JUL-<span class="hljs-number">08</span> C00025 A011
<span class="hljs-number">200105</span> <span class="hljs-number">2500</span> <span class="hljs-number">18</span>-JUL-<span class="hljs-number">08</span> C00025 A011
<span class="hljs-number">200117</span> <span class="hljs-number">800</span> <span class="hljs-number">20</span>-OCT-<span class="hljs-number">08</span> C00014 A001
<span class="hljs-number">200124</span> <span class="hljs-number">500</span> <span class="hljs-number">20</span>-JUN-<span class="hljs-number">08</span> C00017 A007
<span class="hljs-number">200112</span> <span class="hljs-number">2000</span> <span class="hljs-number">30</span>-MAY-<span class="hljs-number">08</span> C00016 A007
<span class="hljs-comment">###################### AWK ##########################</span>
<span class="hljs-comment"># $3 : agents.working_area</span>
<span class="hljs-comment"># $1 : agents.agent_code</span>
<span class="hljs-comment"># $6 : orders.agent_code</span>
$ awk <span class="hljs-string">'
NR == FNR { if ($3 == "Bangalore") ac[$1]; next }
{
if ( $6 in ac )
printf "%d %6d %11s %8s %6s\n", $1,$2,$4,$5,$6
}
'</span> FS=<span class="hljs-string">' *, *'</span> agents FS=<span class="hljs-string">' '</span> orders
<span class="hljs-number">200130</span> <span class="hljs-number">2500</span> <span class="hljs-number">30</span>-JUL-<span class="hljs-number">08</span> C00025 A011
<span class="hljs-number">200105</span> <span class="hljs-number">2500</span> <span class="hljs-number">18</span>-JUL-<span class="hljs-number">08</span> C00025 A011
<span class="hljs-number">200117</span> <span class="hljs-number">800</span> <span class="hljs-number">20</span>-OCT-<span class="hljs-number">08</span> C00014 A001
<span class="hljs-number">200124</span> <span class="hljs-number">500</span> <span class="hljs-number">20</span>-JUN-<span class="hljs-number">08</span> C00017 A007
<span class="hljs-number">200112</span> <span class="hljs-number">2000</span> <span class="hljs-number">30</span>-MAY-<span class="hljs-number">08</span> C00016 A007
</code></pre>
<h4 id="multiple-column-subquery">Multiple Column Subquery</h4>
<pre><code class="lang-bash">SELECT ord_num, agent_code, ord_date, ord_amount
FROM orders
WHERE (agent_code, ord_amount) IN
(SELECT agent_code, MIN(ord_amount)
FROM orders
GROUP BY agent_code)
ORDER BY agent_code
ORD_NUM AGENT_CODE ORD_DATE ORD_AMOUNT
-------- ---------- --------- ----------
<span class="hljs-number">200117</span> A001 <span class="hljs-number">20</span>-OCT-<span class="hljs-number">08</span> <span class="hljs-number">800</span>
<span class="hljs-number">200120</span> A002 <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200126</span> A002 <span class="hljs-number">24</span>-JUN-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200123</span> A002 <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
.....
.....
<span class="hljs-comment">###################### AWK ##########################</span>
<span class="hljs-comment"># $6 : orders.agent_code</span>
<span class="hljs-comment"># $2 : orders.ord_amount</span>
$ awk <span class="hljs-operator">-f</span> - <<\EOF orders orders
NR == FNR {
<span class="hljs-keyword">if</span> (ac[<span class="hljs-variable">$6</span>]) {
ac[<span class="hljs-variable">$6</span>] = ( <span class="hljs-variable">$2</span> < ac[<span class="hljs-variable">$6</span>] ? <span class="hljs-variable">$2</span> : ac[<span class="hljs-variable">$6</span>] ) <span class="hljs-comment"># MIN(ord_amount) 을 위한 부분</span>
} <span class="hljs-keyword">else</span> { ac[<span class="hljs-variable">$6</span>] = <span class="hljs-variable">$2</span> }
next
}{
<span class="hljs-keyword">if</span> ((<span class="hljs-variable">$6</span> <span class="hljs-keyword">in</span> ac) && (ac[<span class="hljs-variable">$6</span>] == <span class="hljs-variable">$2</span>))
<span class="hljs-comment"># 출력때 $6 가 group by 되는 것을 방지하기 위해 i++ 를 추가</span>
r[<span class="hljs-variable">$6</span>,i++] = sprintf(<span class="hljs-string">"%d %6s %11s %6d"</span>, <span class="hljs-variable">$1</span>, <span class="hljs-variable">$6</span>, <span class="hljs-variable">$4</span>, <span class="hljs-variable">$2</span>)
}
END {
delete ac
PROCINFO[<span class="hljs-string">"sorted_in"</span>] = <span class="hljs-string">"@ind_str_asc"</span>
<span class="hljs-keyword">for</span> ( i <span class="hljs-keyword">in</span> r ) <span class="hljs-built_in">print</span> r[i]
}
EOF
<span class="hljs-number">200117</span> A001 <span class="hljs-number">20</span>-OCT-<span class="hljs-number">08</span> <span class="hljs-number">800</span>
<span class="hljs-number">200120</span> A002 <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200126</span> A002 <span class="hljs-number">24</span>-JUN-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200123</span> A002 <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200100</span> A003 <span class="hljs-number">08</span>-JAN-<span class="hljs-number">08</span> <span class="hljs-number">1000</span>
<span class="hljs-number">200121</span> A004 <span class="hljs-number">23</span>-SEP-<span class="hljs-number">08</span> <span class="hljs-number">1500</span>
<span class="hljs-number">200104</span> A004 <span class="hljs-number">13</span>-MAR-<span class="hljs-number">08</span> <span class="hljs-number">1500</span>
<span class="hljs-number">200103</span> A005 <span class="hljs-number">15</span>-MAY-<span class="hljs-number">08</span> <span class="hljs-number">1500</span>
<span class="hljs-number">200118</span> A006 <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200124</span> A007 <span class="hljs-number">20</span>-JUN-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200111</span> A008 <span class="hljs-number">10</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">1000</span>
<span class="hljs-number">200116</span> A009 <span class="hljs-number">13</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">500</span>
<span class="hljs-number">200135</span> A010 <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> <span class="hljs-number">2000</span>
<span class="hljs-number">200130</span> A011 <span class="hljs-number">30</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">2500</span>
<span class="hljs-number">200105</span> A011 <span class="hljs-number">18</span>-JUL-<span class="hljs-number">08</span> <span class="hljs-number">2500</span>
<span class="hljs-number">200131</span> A012 <span class="hljs-number">26</span>-AUG-<span class="hljs-number">08</span> <span class="hljs-number">900</span>
</code></pre>
<h3 id="average">AVERAGE</h3>
<p>평균값을 구하기 위해 <code>ac[$6]["AS"]</code> 에는 sum 값이 설정되고
<code>ac[$6]["AC"]</code> 에는 count 값이 설정됩니다.
ORDER BY DESC 절을 구현하기 위해 compare() 함수에서 등호로 <code><</code> 대신 <code>></code> 가 사용되었습니다.</p>
<pre><code class="lang-bash">SELECT agent_code, AVG(ord_amount) AS average
FROM orders
GROUP BY agent_code
ORDER BY average DESC
<span class="hljs-comment">###################### AWK ##########################</span>
<span class="hljs-comment"># $6 : orders.agent_code</span>
<span class="hljs-comment"># $2 : orders.ord_amount</span>
$ awk <span class="hljs-operator">-f</span> - <<\EOF orders
{
ac[<span class="hljs-variable">$6</span>][<span class="hljs-string">"AS"</span>] += <span class="hljs-variable">$2</span>
ac[<span class="hljs-variable">$6</span>][<span class="hljs-string">"AC"</span>]++
}
END {
PROCINFO[<span class="hljs-string">"sorted_in"</span>] = <span class="hljs-string">"compare"</span>
<span class="hljs-keyword">for</span> ( i <span class="hljs-keyword">in</span> ac ) <span class="hljs-built_in">printf</span> <span class="hljs-string">"%s %10d\n"</span>, i, ac[i][<span class="hljs-string">"AS"</span>] / ac[i][<span class="hljs-string">"AC"</span>]
}
<span class="hljs-keyword">function</span> compare(i1, v1, i2, v2, a1, a2)
{
a1 = v1[<span class="hljs-string">"AS"</span>] / v1[<span class="hljs-string">"AC"</span>]
a2 = v2[<span class="hljs-string">"AS"</span>] / v2[<span class="hljs-string">"AC"</span>]
<span class="hljs-keyword">if</span> ( a1 > a2 ) <span class="hljs-built_in">return</span> -<span class="hljs-number">1</span> <span class="hljs-comment"># ORDER BY DESC 를 위해 '>' 사용</span>
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> ( a1 == a2 ) <span class="hljs-built_in">return</span> <span class="hljs-number">0</span>
<span class="hljs-keyword">else</span> <span class="hljs-built_in">return</span> <span class="hljs-number">1</span>
}
EOF
A010 <span class="hljs-number">3400</span>
A005 <span class="hljs-number">2566</span>
A011 <span class="hljs-number">2500</span>
A008 <span class="hljs-number">2500</span>
A004 <span class="hljs-number">2375</span>
A002 <span class="hljs-number">1814</span>
A003 <span class="hljs-number">1750</span>
A006 <span class="hljs-number">1500</span>
A012 <span class="hljs-number">1450</span>
A007 <span class="hljs-number">1250</span>
A001 <span class="hljs-number">800</span>
A009 <span class="hljs-number">500</span>
</code></pre>
<h2 id="data-files">Data Files</h2>
<p>awk 에서 사용할 때는 헤더 부분을 제외하고 사용하시면 됩니다.</p>
<pre><code class="lang-bash">$ cat agents
AGENT_CODE AGENT_NAME WORKING_AREA COMMISSION PHONE_NO
+------------+--------------+-----------------+------------+-----------------+
A007 , Ramasundar , Bangalore , <span class="hljs-number">0.15</span> , <span class="hljs-number">077</span>-<span class="hljs-number">25814763</span>
A003 , Alex , London , <span class="hljs-number">0.13</span> , <span class="hljs-number">075</span>-<span class="hljs-number">12458969</span>
A008 , Alford , New York , <span class="hljs-number">0.12</span> , <span class="hljs-number">044</span>-<span class="hljs-number">25874365</span>
A011 , Ravi Kumar , Bangalore , <span class="hljs-number">0.15</span> , <span class="hljs-number">077</span>-<span class="hljs-number">45625874</span>
A010 , Santakumar , Chennai , <span class="hljs-number">0.14</span> , <span class="hljs-number">007</span>-<span class="hljs-number">22388644</span>
A012 , Lucida , San Jose , <span class="hljs-number">0.12</span> , <span class="hljs-number">044</span>-<span class="hljs-number">52981425</span>
A005 , Anderson , Brisban , <span class="hljs-number">0.13</span> , <span class="hljs-number">045</span>-<span class="hljs-number">21447739</span>
A001 , Subbarao , Bangalore , <span class="hljs-number">0.14</span> , <span class="hljs-number">077</span>-<span class="hljs-number">12346674</span>
A002 , Mukesh , Mumbai , <span class="hljs-number">0.11</span> , <span class="hljs-number">029</span>-<span class="hljs-number">12358964</span>
A006 , McDen , London , <span class="hljs-number">0.15</span> , <span class="hljs-number">078</span>-<span class="hljs-number">22255588</span>
A004 , Ivan , Torento , <span class="hljs-number">0.15</span> , <span class="hljs-number">008</span>-<span class="hljs-number">22544166</span>
A009 , Benjamin , Hampshair , <span class="hljs-number">0.11</span> , <span class="hljs-number">008</span>-<span class="hljs-number">22536178</span>
$ cat orders
ORD_NUM ORD_AMOUNT ADVANCE_AMOUNT ORD_DATE CUST_CODE AGENT_CODE
---------- ---------- -------------- --------- --------------- ------------
<span class="hljs-number">200114</span> <span class="hljs-number">3500</span> <span class="hljs-number">2000</span> <span class="hljs-number">15</span>-AUG-<span class="hljs-number">08</span> C00002 A008
<span class="hljs-number">200122</span> <span class="hljs-number">2500</span> <span class="hljs-number">400</span> <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> C00003 A004
<span class="hljs-number">200118</span> <span class="hljs-number">500</span> <span class="hljs-number">100</span> <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> C00023 A006
<span class="hljs-number">200119</span> <span class="hljs-number">4000</span> <span class="hljs-number">700</span> <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> C00007 A010
<span class="hljs-number">200121</span> <span class="hljs-number">1500</span> <span class="hljs-number">600</span> <span class="hljs-number">23</span>-SEP-<span class="hljs-number">08</span> C00008 A004
<span class="hljs-number">200130</span> <span class="hljs-number">2500</span> <span class="hljs-number">400</span> <span class="hljs-number">30</span>-JUL-<span class="hljs-number">08</span> C00025 A011
<span class="hljs-number">200134</span> <span class="hljs-number">4200</span> <span class="hljs-number">1800</span> <span class="hljs-number">25</span>-SEP-<span class="hljs-number">08</span> C00004 A005
<span class="hljs-number">200108</span> <span class="hljs-number">4000</span> <span class="hljs-number">600</span> <span class="hljs-number">15</span>-FEB-<span class="hljs-number">08</span> C00008 A004
<span class="hljs-number">200103</span> <span class="hljs-number">1500</span> <span class="hljs-number">700</span> <span class="hljs-number">15</span>-MAY-<span class="hljs-number">08</span> C00021 A005
<span class="hljs-number">200105</span> <span class="hljs-number">2500</span> <span class="hljs-number">500</span> <span class="hljs-number">18</span>-JUL-<span class="hljs-number">08</span> C00025 A011
<span class="hljs-number">200109</span> <span class="hljs-number">3500</span> <span class="hljs-number">800</span> <span class="hljs-number">30</span>-JUL-<span class="hljs-number">08</span> C00011 A010
<span class="hljs-number">200101</span> <span class="hljs-number">3000</span> <span class="hljs-number">1000</span> <span class="hljs-number">15</span>-JUL-<span class="hljs-number">08</span> C00001 A008
<span class="hljs-number">200111</span> <span class="hljs-number">1000</span> <span class="hljs-number">300</span> <span class="hljs-number">10</span>-JUL-<span class="hljs-number">08</span> C00020 A008
<span class="hljs-number">200104</span> <span class="hljs-number">1500</span> <span class="hljs-number">500</span> <span class="hljs-number">13</span>-MAR-<span class="hljs-number">08</span> C00006 A004
<span class="hljs-number">200106</span> <span class="hljs-number">2500</span> <span class="hljs-number">700</span> <span class="hljs-number">20</span>-APR-<span class="hljs-number">08</span> C00005 A002
<span class="hljs-number">200125</span> <span class="hljs-number">2000</span> <span class="hljs-number">600</span> <span class="hljs-number">10</span>-OCT-<span class="hljs-number">08</span> C00018 A005
<span class="hljs-number">200117</span> <span class="hljs-number">800</span> <span class="hljs-number">200</span> <span class="hljs-number">20</span>-OCT-<span class="hljs-number">08</span> C00014 A001
<span class="hljs-number">200123</span> <span class="hljs-number">500</span> <span class="hljs-number">100</span> <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> C00022 A002
<span class="hljs-number">200120</span> <span class="hljs-number">500</span> <span class="hljs-number">100</span> <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> C00009 A002
<span class="hljs-number">200116</span> <span class="hljs-number">500</span> <span class="hljs-number">100</span> <span class="hljs-number">13</span>-JUL-<span class="hljs-number">08</span> C00010 A009
<span class="hljs-number">200124</span> <span class="hljs-number">500</span> <span class="hljs-number">100</span> <span class="hljs-number">20</span>-JUN-<span class="hljs-number">08</span> C00017 A007
<span class="hljs-number">200126</span> <span class="hljs-number">500</span> <span class="hljs-number">100</span> <span class="hljs-number">24</span>-JUN-<span class="hljs-number">08</span> C00022 A002
<span class="hljs-number">200129</span> <span class="hljs-number">2500</span> <span class="hljs-number">500</span> <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> C00024 A006
<span class="hljs-number">200127</span> <span class="hljs-number">2500</span> <span class="hljs-number">400</span> <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> C00015 A003
<span class="hljs-number">200128</span> <span class="hljs-number">3500</span> <span class="hljs-number">1500</span> <span class="hljs-number">20</span>-JUL-<span class="hljs-number">08</span> C00009 A002
<span class="hljs-number">200135</span> <span class="hljs-number">2000</span> <span class="hljs-number">800</span> <span class="hljs-number">16</span>-SEP-<span class="hljs-number">08</span> C00007 A010
<span class="hljs-number">200131</span> <span class="hljs-number">900</span> <span class="hljs-number">150</span> <span class="hljs-number">26</span>-AUG-<span class="hljs-number">08</span> C00012 A012
<span class="hljs-number">200133</span> <span class="hljs-number">1200</span> <span class="hljs-number">400</span> <span class="hljs-number">29</span>-JUN-<span class="hljs-number">08</span> C00009 A002
<span class="hljs-number">200100</span> <span class="hljs-number">1000</span> <span class="hljs-number">600</span> <span class="hljs-number">08</span>-JAN-<span class="hljs-number">08</span> C00015 A003
<span class="hljs-number">200110</span> <span class="hljs-number">3000</span> <span class="hljs-number">500</span> <span class="hljs-number">15</span>-APR-<span class="hljs-number">08</span> C00019 A010
<span class="hljs-number">200107</span> <span class="hljs-number">4500</span> <span class="hljs-number">900</span> <span class="hljs-number">30</span>-AUG-<span class="hljs-number">08</span> C00007 A010
<span class="hljs-number">200112</span> <span class="hljs-number">2000</span> <span class="hljs-number">400</span> <span class="hljs-number">30</span>-MAY-<span class="hljs-number">08</span> C00016 A007
<span class="hljs-number">200113</span> <span class="hljs-number">4000</span> <span class="hljs-number">600</span> <span class="hljs-number">10</span>-JUN-<span class="hljs-number">08</span> C00022 A002
<span class="hljs-number">200102</span> <span class="hljs-number">2000</span> <span class="hljs-number">300</span> <span class="hljs-number">25</span>-MAY-<span class="hljs-number">08</span> C00012 A012
</code></pre>
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