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1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 640w, https://miro.medium.com/v2/resize:fit:720/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 720w, https://miro.medium.com/v2/resize:fit:750/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 750w, https://miro.medium.com/v2/resize:fit:786/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 786w, https://miro.medium.com/v2/resize:fit:828/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 828w, https://miro.medium.com/v2/resize:fit:1100/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 1100w, https://miro.medium.com/v2/resize:fit:1400/1*yslazDxbNzoiRAXFyH6Gpw.jpeg 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh nc oi c" width="700" height="566" loading="lazy" role="presentation"/></picture></div></div><figcaption class="oj ff ok nv nw ol om bf b bg z du">My data example is all about my artwork pricing</figcaption></figure><h1 id="19b2" class="on oo hd bf op oq or ii os ot ou il ov ow ox oy oz pa pb pc pd pe pf pg ph pi bk">Introduction</h1><p id="ef10" class="pw-post-body-paragraph pj pk hd pl b ig pm pn po ij pp pq pr ps pt pu pv pw px py pz qa qb qc qd qe gw bk">For the last five weeks, I have been publishing SQL lessons on Medium. Several of my mates expressed an interest in learning data science while social distancing, so I thought it would be fun to help them out. I thought it was a good idea to start with learning SQL, as that is the one thing I wish I had learned earlier when I was training to become a data scientist.</p><p id="2b2a" class="pw-post-body-paragraph pj pk hd pl b ig qf pn po ij qg pq pr ps qh pu pv pw qi py pz qa qj qc qd qe gw bk">It is a great place to start, as you first need to be able to access data in order to be able to analyse it. SQL is also a very straightforward and logical programming language, so I think it is a nice gradual introduction to the world of data science.</p><p id="a408" class="pw-post-body-paragraph pj pk hd pl b ig qf pn po ij qg pq pr ps qh pu pv pw qi py pz qa qj qc qd qe gw bk">I wanted my lessons to be approachable, so that there was a low barrier to entry for people getting started. That is also why I have made my examples fun and a little bit silly. You can’t take life too seriously in these troubled pandemic times.</p><h1 id="66ac" class="on oo hd bf op oq or ii os ot ou il ov ow ox oy oz pa pb pc pd pe pf pg ph pi bk">Previous lesson</h1><p id="c427" class="pw-post-body-paragraph pj pk hd pl b ig pm pn po ij pp pq pr ps pt pu pv pw px py pz qa qb qc qd qe gw bk">Last week we had our last lesson where a new SQL concept was introduced. We learned how to combine tables. Using the UNION and UNION ALL keywords, we stacked data sets on top of each other. Further, we…</p></div></div></div></div></section></div></div></article></div><div class="l"></div><footer class="qk ql qm qn gv ab q qo jk c"><div class="l ae"><div class="ab cb"><div class="ci bh fz ga gb gc"><div class="ab cp qp"><div class="ab q lu"><div class="qq l"><span class="l qr qs qt e d"><div class="ab q lu lv"><div class="pw-multi-vote-icon fj gt lw lx ly"><span><a class="af ag ah ai aj ak al am an ao ap aq ar as at" data-testid="footerClapButton" href="https://medium.com/m/signin?actionUrl=https%3A%2F%2Fmedium.com%2F_%2Fvote%2Ftowards-data-science%2Fc60ea8bbe170&operation=register&redirect=https%3A%2F%2Ftowardsdatascience.com%2Fsql-for-beginners-c60ea8bbe170&user=Kate+Marie+Lewis&userId=feb55b31bbd5&source=---footer_actions--c60ea8bbe170---------------------clap_footer-----------" rel="noopener follow"><div><div class="bm" aria-hidden="false"><div class="lz ao ma mb mc md am me mf mg ly"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" 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