当前位置: Oracle DBA培训网-优技培训 >> 082题库 >

OCP 19c 认证1Z0-082考试题库(-2题)

OCP 19c 认证1Z0-082考试题库(-2题)

OCP 19c 认证1Z0-082考试题库(-1题)-CUUG内部学员版082题库解析

2.Which statement is true about the INTERSECT operator used in compound queries?

A. Multiple INTERSECT operators are not possible in the same SQL statement

B. It processes NULLs in the selected columns

C. INTERSECT is of lower precedence than UNION or UNION ALL

D. It ignores NULLs

Answer: B

(解析:为了符合新出现的 SQL 标准,Oracle 的未来版本将赋予 INTERSECT 运算符比其他 set运算符更高的优先级。因此,在使用 INTERSECT 运算符和其他集合运算符的查询中,应该使用括号来指定求值顺序。INTERSECT 不会忽略空值。)

技术沙龙MORE+

标签错误:<!-- #Label# labelId=20160707140604 moduleId=1 classId=12231768634 orderby=2 fields=url,title,u_info attribute= datatypeId=22192428132 recordCount=3 pageSize= <htmlTemplate><dt><img src="/images/index_26${index}.jpg" width="100" height="62" /><a href="$url" title="${title}">${title}</a><span>${api.left(u_info,60)}</span></dt></htmlTemplate> -->
我要参加技术沙龙