MySQL在右表數據不惟一的情形下應用left join的辦法

MySQL在右表數據不惟一的情形下應用left join的辦法。本站提示廣大學習愛好者：（MySQL在右表數據不惟一的情形下應用left join的辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是MySQL在右表數據不惟一的情形下應用left join的辦法正文

　　之前為年夜家引見了好幾款導航菜單，明天要給年夜家帶來一款純css3完成的環形導航菜單。該導航比擬新穎，列表圖標位於中央，單擊列表圖標的時刻，各項散布於列表圖表的周圍。構成一個環形。後果圖以下：

　　完成的代碼。

　　html代碼：

<div class="container">
<h1>
Cool Open/Close menu in full CSS</h1>
<input type="checkbox" id="menu_opener_id" class="menu_opener">
<label for="menu_opener_id" class="menu_opener_label">
</label>
<div class="barre_hamburger">
</div>
<a href="#" class="link_one link_general"></a><a href="#" class="link_two link_general">
</a><a href="#" class="link_three link_general"></a><a href="#" class="link_four link_general">
</a></input>
</div>

　　css代碼：

[code]body
        {
            background: #34495e;
        }
       
        .container
        {
            width: 550px;
            display: block;
            margin: auto;
            position: relative;
        }
       
        h1
        {
            text-align: center;
            font-family: 'Roboto' , sans-serif;
            font-weight: 400;
            color: #f1c40f;
        }
       
        .menu_opener
        {
            display: none;
        }
       
        .menu_opener:checked ~ .link_one
        {
            top: 65px;
        }
        .menu_opener:checked ~ .link_two
        {
            left: 385px;
        }
        .menu_opener:checked ~ .link_three
        {
            top: 385px;
        }
        .menu_opener:checked ~ .link_four
        {
            left: 65px;
        }
        .menu_opener:checked ~ .barre_hamburger
        {
            opacity: 0;
        }
        .menu_opener:checked ~ .menu_opener_label:after
        {
            transform: rotate(45deg);
            top: 70px;
        }
        .menu_opener:checked ~ .menu_opener_label:before
        {
            transform: rotate(-45deg);
            top: 70px;
        }
       
        .menu_opener_label
        {
            background: #f1c40f;
            width: 150px;
            height: 150px;
            display: block;
            cursor: pointer;
            border-radius: 50%;
            position: absolute;
            top: 200px;
            left: 200px;
            z-index: 10;
        }
        .menu_opener_label:after
        {
            position: absolute;
            top: 50px;
            left: 50px;
            background: #000;
            content: "";
            width: 50px;
            height: 10px;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
        .menu_opener_label:before
        {
            position: absolute;
            top: 90px;
            left: 50px;
            background: #000;
            content: "";
            width: 50px;
            height: 10px;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
       
        .barre_hamburger
        {
            width: 50px;
            height: 10px;
            position: absolute;
            top: 270px;
            left: 250px;
            background: #000;
            z-index: 20;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
       
        .link_general
        {
            width: 100px;
            height: 100px;
            display: block;
            border-radius: 50%;
            position: absolute;
            top: 225px;
            left: 225px;
            background: #ecf0f1;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
       
        .link_one
        {
            background: url("home.png") #f1c40f no-repeat center center;
        }
       
        .link_two
        {
            background: url("mail.png") #f1c40f no-repeat center center;
        }
       
        .link_three
        {
            background: url("set.png") #f1c40f no-repeat center center;
        }
       
        .link_four
        {
            background: url("start.png") #f1c40f no-repeat center center;
        }　　[code]