{"width":"100%","type":"rich","version":"1.0","provider_name":"Hatena Blog","blog_url":"https://htn20190109.hatenablog.com/","provider_url":"https://hatena.blog","categories":["DB"],"url":"https://htn20190109.hatenablog.com/entry/2019/05/06/135311","published":"2019-05-06 13:53:11","height":"190","title":"\u6587\u5b57\u5217\u9023\u7d50","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2019%2F05%2F06%2F135311\" title=\"\u6587\u5b57\u5217\u9023\u7d50 - HTN20190109\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"blog_title":"HTN20190109\u306e\u65e5\u8a18","author_name":"HTN20190109","author_url":"https://blog.hatena.ne.jp/HTN20190109/","description":"Oracle select 'Hello' || ' World' from dual;select concat('Hello',' World') from dual; MySQL select CONCAT('A','B'); PostgreSQL select 'Hello' || ' World';select concat('Hello',' World'); SQL Server select 'Hello' + ' World' ;select concat('Hello',' World') ;"}