is something preventing you from doing so?? You can if you want.Me, I'll stick with "select user from dual". I know dual exists. I know it has at least1andat most1row. I know the optimizer knows all about dualanddoes the most efficient thingforme.5) yes6) the optimizer understand...
SELECTUPPER('This is a string')FROMwhat_table;Code language:SQL (Structured Query Language)(sql) In this case, you might think about creating a table and use it in theFROMclause for just using theUPPER()function. Fortunately, Oracle provides you with theDUALtable which is a special table ...
于是以“X$DUAL oracle”为关键词google了一下,找到Tom的一篇文章 1.What is the dual table, what is its purpose. dual is just a convienence table. You don't need to use it, you can use anything you want. The advantage to dual is the optimizer understands dual is a special one row, ...
SQL profile is a collection of additional statistical information stored in the data dictionary that helps the optimizer to generate the best plan for the query. SQL profile is managed through SQL_TUNE package of SQL tuning advisor. i.e when we run SQL tuning advisor against a query, The tun...
百度试题 题目SQL> SELECT TRUNC(ROUND(156.00,-1),-1) FROM DUAL; What would be the outcome?(结果是什么?) A. 16 B. 100 C. 160 D. 200 E. 150 相关知识点: 试题来源: 解析 C.160 反馈 收藏
So, if you try to run SELECT SYSDATE by itself, without the FROM DUAL part, you’ll get an error. This is because the FROM is required. Now, this is only Oracle-specific. If you’ve used SQL Server or MySQL, you don’t need to specify a DUAL table. What Columns...
Oracle in-memory dual-format数据库结合了基于行的buffer和基于列的内存压缩单元 (IMCU) 来一起处理 OLTP 和 OLAP 工作负载。IMCU 从buffer填充,changes会缓存在快照元数据单元 (SMU) 中。另一个例子是 SQL Server,它在 Hekaton 行引擎中的内存表上开发了列存储索引 (CSI),以实现实时分析处理。这种类型的 H...
4. What is the result of the following query? SELECT ADD_YEARS ('11-JAN-94',6) FROM dual;A、This in not a valid SQL statementB、 11-Jul-95C、 11-Jan-00D、 11-Jul-00 . 相关知识点: 试题来源: 解析 A 本题考查对文本内容的理解与语言组织、表述能力。 解答时,需要紧扣题干所呈现的...
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i am migrating the oracle database into the sql server database. can any suggest the equivalent quires in sql server. SELECT TRUNC (TO_DATE('02-MAY-19'), 'IW') from dual; SELECT TRUNC (TO_DATE('02-MAY-19'), 'W') from dual; currently i am using the Microsoft SQL Server ...