首页 > 数据库 > Oracle > OCP 1Z0-051-74
A. MOD:returns the quotient of a division
B. TRUNC:can be used with NUMBER and DATE values
C. CONCAT:can be used to combine any number of values
D. SYSDATE:returns the database server current date and time
E. INSTR:can be used to find only the first occurrence of a character in a string
F. TRIM:can be used to remove all the occurrences of a character from a string
答案:(B、D)
解析:
A(X),返回的是余数,而不是商
C(X),得是能隐式转换为字符串的数值, 科学计数法或16进制形式的数字都不能进行连接
E(X),可以指定查询子串第几次出现的位置
来自 “ ITPUB博客 ” ,链接:https://blog.itpub.net/17013648/viewspace-1162362/ ,如需转载,请注明出处,否则将追究法律责任。