{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.manongdao.com/data/attach/logo/logo.png', '推荐 SAY GOODBYE 的问题《Where can I find SQL language specification》','https://www.manongdao.com/q-549730.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
Is there an official SQL standard? I.e. I want to understand what type of expression is supported by SQL language and how this expression evaluated by server? What documents are using for implementation SQL based databases?
相关问题
- SQL join to get the cartesian product of 2 columns
- sql execution latency when assign to a variable
- Difference between Types.INTEGER and Types.NULL in
- php PDO::FETCH_ASSOC doesnt detect select after ba
- Bulk update SQL Server C#
There is an official SQL standard from the ISO/ANSI committee.
Some information can be found here: http://en.wikipedia.org/wiki/Sql
However the specification itself is not freely available. You might find some drafts of older specs in the internet if you search for it.
A nice explanation of the (yet a bit old) ANSI 99 standard is here: https://mariadb.com/kb/en/sql-99-complete-really/