OCP-051-007
7. Which two statements are true regarding the USING and ON clauses in table joins? (Choose two.)
关于USING和ON子句, 哪儿个是正确的
A. Both USING and ON clauses can be used for equijoins and nonequijoins.
--using不能用于不等值连接
B. A maximum of one pair of columns can be joined between two tables using the ON clause.
--on可以用多个列进行连接
C. The ON clause can be used to join tables on columns that have different names but compatible data types.
D. The WHERE clause can be used to apply additional conditions in SELECT statements containing the
ON or the USING clause
关于USING和ON子句, 哪儿个是正确的
A. Both USING and ON clauses can be used for equijoins and nonequijoins.
--using不能用于不等值连接
B. A maximum of one pair of columns can be joined between two tables using the ON clause.
--on可以用多个列进行连接
C. The ON clause can be used to join tables on columns that have different names but compatible data types.
D. The WHERE clause can be used to apply additional conditions in SELECT statements containing the
ON or the USING clause
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/29654587/viewspace-2156058/ ，如需转载，请注明出处，否则将追究法律责任。
上一篇：
OCP-051-006
下一篇：
OCP-051-008
请登录后发表评论
登录
全部评论
