在Sql更新查询中添加float类型字段

Question

我正在使用以下查询更新值

setRequestedOrientation()

此查询有效，但它也更新了field_number = 4.3和field_number = 4.4的值。

field_number字段类型为float。

我做错了吗？

由于 Ballu

Answer 1

您正在投射到DECIMAL，它没有小数。

您需要将（M，D）添加到DECIMAL(M,D)。

mysql> select CAST(4.3 AS DECIMAL);
+----------------------+
| CAST(4.3 AS DECIMAL) |
+----------------------+
|                    4 |
+----------------------+
1 row in set (0.00 sec)

mysql> select CAST(4.3 AS DECIMAL(10,5));
+----------------------------+
| CAST(4.3 AS DECIMAL(10,5)) |
+----------------------------+
|                    4.30000 |
+----------------------------+
1 row in set (0.00 sec)

mysql> select CAST(4.3 AS DECIMAL(10,5)) = CAST(4.2 AS DECIMAL(10,5));
+---------------------------------------------------------+
| CAST(4.3 AS DECIMAL(10,5)) = CAST(4.2 AS DECIMAL(10,5)) |
+---------------------------------------------------------+
|                                                       0 |
+---------------------------------------------------------+
1 row in set (0.00 sec)

-- Add some decimal
UPDATE cfbnv_rg_lead_detail SET value='Address' WHERE lead_id='175' && form_id='1' && CAST(field_number AS DECIMAL(10,5)) = CAST(4.2 AS DECIMAL(10,5)).