public/sql.md
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# SQL / Relational
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-<style type="text/css">
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-div .venn {
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- float: left;
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- width: 300px;
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- height: 300px;
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- border-radius: 150px;
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- border: 3px solid #000;
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- color: #000;
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- text-align: center;
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- vertical-align: middle;
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- font-size: 1.0em;
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- line-height: 300px;
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- font-weight: bold;
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- font-family: sans-serif;
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- position: relative;
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-}
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-.inner_one { background-color: yellow; opacity: 0.5; }
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-.inner_two::before{ content: 'id = name_id'; position: absolute; left: 10px }
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-.inner_two { background-color: red; opacity: 0.5; margin-left: -110px; }
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-
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-.left_one { background-color: #ff8040; opacity: 0.5; z-index: 1; }
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-.left_two { background-color: red; opacity: 0.5; margin-left: -110px; }
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-</style>
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-
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<div class="venn left_one">a</div>
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<div class="venn left_two">b</div>
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