A single row subquery can retrieve data from only one table.
A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.
A SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.
A single row subquery can retrieve data from more than one table.
A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
A multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.
第1题：
A. 1 is the default precedence.
B. A lower number is preferred.
C. A higher number is preferred.
D. 100 is the default precedence.
第2题：
Which two statements are true about L2TP tunnels?（） (Choose two.)
第3题：
A. PAT is not supported.
B. PAT is enabled by default.
C. It supports the address-persistent configuration option.
D. It supports the junos-global configuration option.
第4题：
Which two statements about VPLS are true？ （）
第5题：
Which two statements about the Cisco Nexus 1000V VSM are true?（）
第6题：
Which two statements about VACLs on Cisco Nexus 7000 Series Switches are true？ （）
第7题：
Which two statements are true about traffic shaping？（）
第8题：
A. AH provides data integrity.
B. AH is identified by IP protocol 50.
C. AH is identified by IP protocol 51.
D. AH cannot work in conjunction with ESP
第9题：
Which two statements about OSPF IPv6 routing are true？（）
第10题：
Which two statements are true about pool-based source NAT? （）(Choose two.)