Which four statements are true about constraints on Oracle tables? A. A Column can have only one CHECK Constraint. B. A NOT NULL Constraint can be defined at the table level. C. A UNIQUE constraint pe ...

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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 ...