culuo4781的博客SQLServer 2016 introduces a new type of table that is designed to keep the full history of data changes, where row validity is managed by the system. This new table type is called a System-Versioned ...
culuo4781的博客sql语句 case The Case statement in SQL is mostly used in a case with equality expressions. The SQL Case statement is usually inside of a Select list to alter the output. What it does is evaluates a ...
AirGo.的博客 第一个参数 thd 为当前线程对象,它可谓是“调试百宝箱”,你可以看到当前执行的 SQL 所有字段和信息,它的类声明在 sql_class.h 第 778行: class THD : public MDL_context_owner, public Query_arena, public ...
NUMBER() OVER (ORDER BY id) AS sid FROM test) a WHERE a.sid=3`或`SELECT TOP 1 * FROM test WHERE id NOT IN (SELECT TOP 2 id FROM test ORDER BY id) ORDER BY id`这两句SQL用于获取表`test`的第三条记录。...
culuo4781的博客sqlserver的搜索 介绍 (Introduction) In most cases, we will use clustered and non-clustered indexes to help a query go faster, but these kinds of indexes have their own limitations and cannot be ...
culuo4781的博客sqlserver 缓存 When we talk about memory usage in SQLServer, we are often referring to the buffer cache. This is an important part of SQLServer’s architecture, and is responsible for the ability...