如何在 oracle 查询中获取字符串的第一行？

Question

到期日：

15/05/12-15/07/12

minimum 15 May 2012 maximum 15 July 2012, the exact period in Charterers option

上面是列中的单元格值，我需要显示该值的唯一第一行，即 15/05/12-15/07/12

To_Char(b.Charter_End_Date, 'DD/MM/RR') || Period_Notice "Expiry Date",

预期结果：

15/05/12-15/07/12

实际结果：

15/05/12-15/07/12

minimum 15 May 2012 maximum 15 July 2012, the exact period in Charterers option

Answer 1

子字符串，最多 CHR(10)，可能是您要查找的内容：

SQL> select * From test;

COL
--------------------------------------------------------------------------------
15/05/12-15/07/12

minimum 15 May 2012 maximum 15 July 2012, the exact period in Charterers option


SQL> select substr(col, 1, instr(col, chr(10))) result
  2  from test;

RESULT
--------------------------------------------------------------------------------
15/05/12-15/07/12

SQL>