1.0sqlity.nethttps://sqlity.net/enSebastian Meinehttps://sqlity.net/en/author/sebastian/rich600338<blockquote class="wp-embedded-content" data-secret="klVRVL8xNG"><a href="https://sqlity.net/en/1401/a-join-a-day-except/">A Join A Day – Except</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://sqlity.net/en/1401/a-join-a-day-except/embed/#?secret=klVRVL8xNG" width="600" height="338" title="“A Join A Day – Except” — sqlity.net" data-secret="klVRVL8xNG" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://sqlity.net/wp-includes/js/wp-embed.min.js /* ]]> */ </script> The EXCEPT keyword can be used to calculate the set theoretical difference of two sets of rows. You can use EXCEPT every time you want to return rows from one table that are not in another table. Under the covers SQL Server uses a Left Anti Semi Join too fulfill an EXCEPT requests.http://sqlity.net/wp-content/uploads/2012/12/two-sets.png