请问php该怎么输出sql语句的函数 ？

Question

php输出sql语句的函数 

Answer 1

ASCII
NCHAR
SOUNDEX

CHAR
PATINDEX
SPACE

CHARINDEX
QUOTENAME
STR

DIFFERENCE
REPLACE
STUFF

LEFT
REPLICATE
SUBSTRING

LEN
REVERSE
UNICODE

LOWER
RIGHT
UPPER

LTRIM
RTRIM

Answer 2

Oracle中 其语法为：
substr函数的用法，取得字符串中指定起始位置和长度的字符串 ，默认是从起始位置到结束的子串。

substr( string, start_position, [ length ] ) substr('目标字符串',开始位置,长度)
如:
substr('This is a test', 6, 2) would return 'is'
substr('This is a test', 6) would return 'is a test'
substr('TechOnTheNet', -3, 3) would return 'Net'
substr('TechOnTheNet', -6, 3) would return 'The'select substr('Thisisatest', -4, 2) value from dual