内部解码Oracle函数中的ORDER BY

Question

我尝试在Oracle Decode函数中使用ORDER BY

编译器说缺少右括号

DECODE(controlNumber, NULL, myOldNUmber, (SELECT myNewNumber FROM tableA A, tableB B WHERE A.control_id = B.control_id AND A.other_id = B.other_id) ) AS finalnumber,

似乎同样的查询没有看到为什么ORDER BY在这里不被接受：

DECODE(controlNumber, NULL, myOldNUmber, (SELECT myNewNumber FROM tableA A, tableB B WHERE A.control_id = B.control_id AND A.other_id = B.other_id ORDER BY createdTime)) AS finalnumber,

Answer 1

我目前无法测试，但请尝试...

DECODE(controlNumber, NULL, myOldNUmber, (SELECT myNewNumber FROM (SELECT myNewNumber FROM tableA A, tableB B WHERE A.control_id = B.control_id AND A.other_id = B.other_id ORDER BY createdTime) WHERE rownum=1) AS finalnumber