一、MySQL Router简介 MySQL Router是MySQL官方提供的一个轻量级中间件，可以在应用程序与MySQL服务器之间提供透明的路由方式。主要用以解决MySQL主从库集群的高可用、负载均衡、易扩展等问题。Router可以 ...

Which three privileges can be restricted to a subset of columns in a table? A. ALTER B. REFERENCES C. UPDATE D. SELECT E. INDEX F. INSERT G. DELETE **** 本内容被作者隐藏 ****

Which three statements are true regarding single row subqueries? A. They must be placed on the left side of the comparison operator or condition. B. They must return a row to prevent errors in the SQL ...

Which two statements are true about the ORDER BY clause? A. Numeric values are displayed in descending order if they have decimal positions. B. Only columns that are specified in the SELECT list can b ...

Which statement is true about aggregate functions? A) The AVG function implicitly converts NULLS to zero. B) The MAX and MIN functions can be used on columns with character datatypes C) Aggregate func ...

Which three are true about system and object privileges A. WITH GRANT OPTION can be used when granting an object privilege to both users and roles B. WITH GRANT OPTION cannot be used when granting an ...

Which three statements are true about the DESCRIBE command? A. It can be used from SQL Developer. B. It can be used to display the structure of an existing view. C. It can be used only from SQL*Plus. ...

Which three statements are true about time zones, date data types, and timestamp data types in an Oracle database? A. The DBTIMEZONE function can return an offset from Universal Coordinated Time (UTC) ...