Question

我在此寻求解决方案。我每月1月和2月都有一个dbf。每个dbf中有两列名为A和B，A是一系列数字，B是vlookup，我想在2月用＆＃34; new＆＃34;替换columnB。如果它在columnA中的值没有出现在1月的A列中，而且＃34; old＆＃34;反之亦然。我的代码如下：

REPLACE ALL B WITH "Old"
REPLACE ALL B WITH "New" FOR A NOT IN (sele A FROM &filejanuary)

感谢。

Answer 1

上述评论员很接近使用SQL UPDATE命令...

// A.h
#include <array>
using namespace std;
constexpr int LENGTH{10};
class A {
      array<int,LENGTH> internalArray;
public:
      const static int LENGTH;
};

注意 - 还有一个VFP命令方法

* --- Replace ALL Feb.B with "Old" ---
UPDATE February SET February.B = 'Old'

* --- Now change Feb.B to "New" for Applicable Conditions ---
UPDATE February SET February.B = 'New' ;
  WHERE February.A NOT IN (SELECT A FROM January)

祝你好运

Answer 2

update February set February.B = 'Old'
update February set February.B = 'New' ;
   where not exists (select * from January where January.A = February.A)

Answer 3

此外，如果你想使用xBase，那么如果1月份有一个索引就更简单了.A（假设它的标签是JanA - 谁真的将字段命名为A，B ......）： / p>

select February
replace all B with iif( seek(February.A, 'January', 'JanA'), 'Old', 'New')

Foxpro取代＆＃34;＆＃34;不在

3 个答案: