Question

我在MYSQL中写了一个查询：

SELECT DISTINCT MeasurementRowIndex, X, Y, Z 
FROM GeneralResultsTable 
WHERE MainDataIndex IN (1, 2) 
ORDER BY FIELD(MeasurementRowIndex , 2, 4, 3, 1, 7, 8, 6, 5)

我得到了：

＆＃39; FIELD＆＃39;无法识别内置函数名称。

有什么想法吗？

Answer 1

如果您的MySQL版本中没有FIELD（），那么您必须解释MeasurementRowIndex并将其转换为提升的数字：

SELECT DISTINCT MeasurementRowIndex, X, Y, Z FROM GeneralResultsTable WHERE MainDataIndex IN (1, 2) 
ORDER BY CASE MeasurementRowIndex 
  WHEN 2 THEN 1 
  WHEN 4 THEN 2 
  WHEN 3 THEN 3 
  WHEN 1 THEN 4 
  WHEN 7 THEN 5 
  WHEN 8 THEN 6 
  WHEN 6 THEN 7 
  WHEN 5 THEN 8 
END

Answer 2

SELECT DISTINCT MeasurementRowIndex，X，Y，Z，FIELD（MeasurementRowIndex，2， 4,3,1,7,8,6,5）来自GeneralResultsTable WHERE MainDataIndex IN（1,2）按字段排序（MeasurementRowIndex，2,4,3,1,7,8,6,5）

Answer 3

SELECT DISTINCT MeasurementRowIndex, X, Y, Z, FIELD(MeasurementRowIndex , 2, 
4, 3, 1, 7, 8, 6, 5) 
FROM GeneralResultsTable 
WHERE MainDataIndex IN (1, 2) 
ORDER BY FIELD(MeasurementRowIndex , 2, 4, 3, 1, 7, 8, 6, 5)

错误在＆＃34; ORDER BY FIELD＆＃34;

3 个答案: