127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
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    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
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                        )

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            [pre_tags] => #em#
            [post_tags] => #/em#
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    [size] => 8
    [from] => 0
)
</pre>RESPONSE:<pre>string(7365) "{"took":16,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":28.11787,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"46580","_score":28.11787,"_source":{"id":"46580","text":"Sql\u8bed\u6cd5---DDL","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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</pre>127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => Sql语法---DDL
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 8
)
</pre>RESPONSE:<pre>string(7267) "{"took":12,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":28.11787,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"203504506","_score":16.109497,"_source":{"id":"203504506","text":"MySQL\u5e38\u7528\u8bed\u53e5-DDL\uff082\uff09","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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                        <h1 class="page-title"><a href="/show-46580.html" title="Sql语法---DDL">Sql语法---DDL</a></h1>
            
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            <footer class="tc"> maybecoding 
                <time class="post-date" datetime="2019-01-03">2019-01-03</time>
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<h3>1.SQL的定义</h3>
<p>结构化查询语言(Structured Query Language)简称SQL,SQL语句就是对数据库进行操作的一种语言。</p>
<hr>
<p> </p>
<h3>2.SQL的作用</h3>
<p>通过SQL语句我们可以方便的操作数据库中的数据、表、数据库等。</p>
<hr>
<h3>3.SQL的分类</h3>
<p>1. DDL(Data Definition Language)数据定义语言<br>用来定义数据库对象：数据库，表，列等。关键字：create, drop,alter等<br>2. DML(Data Manipulation Language)数据操作语言<br>用来对数据库中表的数据进行增删改。关键字：insert, delete, update等<br>3. DQL(Data Query Language)数据查询语言<br>用来查询数据库中表的记录(数据)。关键字：select等<br>4. DCL(Data Control Language)数据控制语言(了解)<br>用来定义数据库的访问权限和安全级别，及创建用户。关键字：GRANT， REVOKE等</p>
<hr>
<h3>4.SQL语法</h3>
<p>　　<strong>1.DDL语句操作数据库</strong></p>
<p><strong>　　创建数据库</strong></p>
<p>　　1. 直接创建数据库<br>　　CREATE DATABASE  数据库名;</p>
<p>　　2. 判断是否存在并创建数据库<br>　　CREATE DATABASE IF NOT EXISTS  数据库名；</p>
<p>　　3. 创建数据库并指定字符集(编码表)<br>　　CREATE DATABASE  数据库名 CHARACTER SET 字符集;</p>
<p>　　<strong>查看数据库</strong></p>
<p><strong>　　</strong>1. 查看所有的数据库<br>　　SHOW database；</p>
<p>　　<img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ERTRMbU51WW14dlozTXVZMjl0TDJKc2IyY3ZNVE0zTWpBek5pOHlNREU1TURFdk1UTTNNakF6TmkweU1ERTVNREV3TXpFeE1URXhPVGM0TmkweE1UUTJPVFEyTWpnNExuQnVadz09" alt=""></p>
<p>　　2. 查看某个数据库的定义信息<br>　　SHOW CREATE DATABASE  数据库名;</p>
<p>　　<img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ERTRMbU51WW14dlozTXVZMjl0TDJKc2IyY3ZNVE0zTWpBek5pOHlNREU1TURFdk1UTTNNakF6TmkweU1ERTVNREV3TXpFeE1UTXdNVEUxTkMwMk1qY3dOamM0T1RBdWNHNW4=" alt=""></p>
<p><strong>　　修改数据库</strong></p>
<p><strong>　</strong>　修改数据库字符集格式</p>
<p>　　ALTER DATABASE  数据库名 DEFAULT CHARACTER SET 字符集；</p>
<p><strong>　　删除数据库</strong></p>
<p><strong>　　</strong>DROP DATABASE  数据库名;</p>
<p> </p>
<p>　　<strong>使用数据库</strong></p>
<p>　　1. 查看正在使用的数据库<br>　　SELECT DATABASE() ;<br>　　2. 使用/切换数据库<br>　　USE  数据库名;　</p>
<p>　　<strong>2.DDL操作表</strong></p>
<p><strong>　　　　1.创建表</strong></p>
<p><strong>　　　　</strong>CREATE TABLE 表名 (<br>　　　　字段名1 字段类型1,<br>　　　　字段名2 字段类型2<br>　　　　);</p>
<p>　　　<strong>　2.查看表</strong></p>
<p><strong>　　　　</strong>1. 查看某个数据库中的所有表<br>　　　　SHOW TABLES ;<br>　　　　2. 查看表结构<br>　　　　DESC  表名;<br>　　　　3. 查看创建表的SQL语句<br>　　　　SHOW CREATE TABLE  表名;</p>
<p>　　　　<strong>3.快速创建一个表结构相同的表</strong></p>
<p><strong>　　　</strong>　CREATE TABLE  新表名 LIKE 旧表名;</p>
<p>　　　<strong>　4.删除表</strong></p>
<p><strong>　　　</strong>　1. 直接删除表<br>　　　　DROP TABLE  表名;<br>　　　　2. 判断表是否存在并删除表<strong><br>　　　　</strong>DROP TABLE IF EXISTS  表名;</p>
<p>　　　　<strong>5.修改表结构</strong></p>
<p><strong>　　　　</strong>1. 添加表列  ALTER TABLE  表名 ADD 列名 类型;</p>
<p>　　　　2. 修改列类型  ALTER TABLE  表名 MODIFY列名 新的类型;</p>
<p>　　　　3. 修改列名  ALTER TABLE  表名 CHANGE 旧列名 新列名 类型;</p>
<p>　　　　4 . 删除列  ALTER TABLE  表名 DROP 列名; 　　</p>
<p>　　　　5. 修改表名  RENAME TABLE  表名 TO 新表名; </p>
<p>　　　　6. 修改字符集  ALTER TABLE  表名 character set 字符集;</p>
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