How to solve the issue of the invalid conversion specified in SQL?

To address the issue of invalid conversion specified in SQL, it is necessary to first determine if the syntax of the conversion directive is correct. If the syntax is correct but the conversion is still invalid, it may be due to the following reasons:

1. The data types do not match: the conversion operation can only be performed between compatible data types. Make sure the data types of the operation are correct and can be converted as needed.
2. Data values cannot be converted: Some data values may not be able to undergo the specified conversion. For example, converting a string containing non-numeric characters to a numeric type may result in an invalid conversion. Please ensure that the data value to be converted is convertible.
3. The data length exceeds the limit: The conversion operation may result in the data length exceeding the limit of the target data type. Please ensure that the length of the data being converted does not exceed the limit of the target data type.
4. Data precision loss: some conversions may result in data precision loss. For example, converting decimals to integers will cause the decimal part to be discarded. Please ensure that the conversion operations do not lead to data precision loss.
5. The desired conversion is not supported by the database: Some databases may not support certain conversion operations. Please refer to the documentation of the database to confirm if the desired conversion is supported.

If the above solutions do not work, it is suggested to provide a more detailed description of the problem and relevant code in order to better help resolve the issue.