在Oracle中,可以通过使用INSTR函数来实现类似于MySQL中的find_in_set功能。INSTR函数用于查找一个字符串在另一个字符串中第一次出现的位置,如果找到则返回位置索引,如果找不到则返回0。例如,如果要在逗号分隔的字符串中查找某个值是否存在,可以使用以下查询:SELECT * FROM table_name WHERE INSTR(',' || column_...
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例如:INSTR('CORPORATE FLOOR','OR', 3, 2)中，源字符串为'CORPORATE FLOOR', 目标字符串为'OR'，起始位置为3，取第2个匹配项的位置。默认查找顺序为从左到右。当起始位置为负数的时候，从右边开始查找。所以SELECT INSTR('CORPORATE FLOOR', 'OR', -1, 1) "Instring" FROM DUAL 的显示...
在MySQL中,有一个函数叫做`FIND_IN_SET`,用于在一个逗号分隔的字符串列表中查找某个值是否存在。然而,在Oracle中并没有类似的内置函数。在Oracle中,可以使用`INSTR`函...
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create or replace function 函数名(参数1 in 数据类型, 参数2 out 数据类型,…) return 数据类型 as|is 结果变量 数据类型;Begin Pl/sql程序体; return(结果变量);end[函数名]; 存储过程和存储函数的区别 一般来讲,过程和函数的区别在于函数可以有一个返回值;而过程没有返回值。
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使用:sqluldr2 --help查看帮助 参数如下: user = username/password@tnsname sql = SQL file name query = select statement field = separator string between fields record = separator string between records rows = print progress for every given rows (default, 1000000) file = output file name(default...