Mysql视图上的查询工作不正常

我在一个视图上运行了一个非常简单的查询，它使用一个值，而不使用所有其他值。我试图从视图中选择具有不同索引值的行，仅索引1.5返回结果

以下是视图表的示例

我有这个观点，伊森

select * from easylens

+---+----+------+----+-----+-----+-----+-------+--------+
|id |type|design|name|brand|index|color|coating|material|
+---+----+------+----+-----+-----+-----+-------+--------+
| 1 | sv |aase  |nel |hoya |  1.5|292  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 2 | sv |base  |tel |zeri |  1.5|293  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 3 | sv |case  |fel |essi |  1.5|294  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 4 | sv |dase  |gel |hoya |  1.6|293  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 5 | sv |fase  |rel |essi |  1.6|293  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 6 | sv |gase  |mel |hoya |  1.6|292  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+

当我跑的时候

select * from easylens where `index`=1.5

我明白了

+---+----+------+----+-----+-----+-----+-------+--------+
|id |type|design|name|brand|index|color|coating|material|
+---+----+------+----+-----+-----+-----+-------+--------+
| 1 | sv |aase  |nel |hoya |  1.5|292  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 2 | sv |base  |tel |zeri |  1.5|293  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 3 | sv |case  |fel |essi |  1.5|294  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+

MySQL returned an empty result set (i.e. zero rows). (Query took 0.0002 sec)

但是当我跑的时候

select * from easylens where `index`=1.6

我明白了

+---+----+------+----+-----+-----+-----+-------+--------+
|id |type|design|name|brand|index|color|coating|material|
+---+----+------+----+-----+-----+-----+-------+--------+
| 1 | sv |aase  |nel |hoya |  1.5|292  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 2 | sv |base  |tel |zeri |  1.5|293  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+
| 3 | sv |case  |fel |essi |  1.5|294  |ar     |plastic |
+---+----+------+----+-----+-----+-----+-------+--------+

MySQL returned an empty result set (i.e. zero rows). (Query took 0.0002 sec)

浮动的危险（精度和比例未定义）

试着投

SELECT * FROM easylens WHERE CAST(`index` as DECIMAL) = CAST(1.6 as DECIMAL);

---

索引

字段的数据类型是什么？@Sadikhasan索引字段是FLOAT将其更改为十进制-或者它可能足以定义浮点中的精度和比例-但我不确定这篇文章为什么会有帮助。它不是关于铸造，而是关于指定长度十进制（m，D）FLOAT（m，D）不太有效