sql语句的执行顺序
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<p>1.from</p>
<p>2.on</p>
<p>3.join</p>
<p>4.where</p>
<p>5.group by</p>
<p>6.avg,sum...</p>
<p>7.having</p>
<p>8.select</p>
<p>9.distinct</p>
<p>10order by</p>
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