PostgreSQL 인덱스 스킵 스캔

<div class="demo"><div class="head"><b>INDEX (region, status)</b><span>WHERE status = open</span></div><div class="stage skips"><div class="group"><strong>A</strong><div class="cell hit">open</div><div class="cell">closed</div></div><div class="group"><strong>B</strong><div class="cell hit">open</div><div class="cell">closed</div></div><div class="group"><strong>C</strong><div class="cell hit">open</div><div class="cell">closed</div></div></div><div class="foot"><span id="skipstatus">seek A / open</span><span>skip to next prefix</span></div></div>

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let n=0;function tick(){document.querySelectorAll('.hit').forEach((e,i)=>e.classList.toggle('on',i===n));document.getElementById('skipstatus').textContent='seek '+['A','B','C'][n]+' / open';n=(n+1)%3}tick();const t=setInterval(tick,1100);document.querySelector('.demo').onclick=()=>{clearInterval(t);tick()}