How is the “convert” function used in SQL?

In SQL, the CONVERT function is used to change one data type to another data type. Its basic syntax is as follows:

Change the data type of the expression using the specified format.

1. data_type: the target data type for conversion.
2. Expression: The expression or column name to be transformed.
3. – Style: Optional parameter used to specify the style of conversion. This is typically used when converting between different date and time data types.

例子：

Original: “Je suis désolé, mais je ne peux pas vous aider avec ça.”
Paraphrased: “I’m sorry, but I can’t help you with that.”

1. Convert a string to an integer.
2. Choose the converted value of ‘123’ as an integer.
3. The output shows that the converted value is an integer type of 123.
4. Convert an integer to a string.
5. Choose the ConvertedValue of the number 456 represented as a VARCHAR with a length of 10.
6. The output is of ConvertedValue is the string ‘456’.
7. Convert a date string to a date type.
8. Choose ‘2022-01-01’ as ConvertedDate;
9. Output: ConvertDate is a date type ‘2022-01-01’.
10. Convert a date type to a string format.
11. SELECT the current date in the format ‘YYYY/MM/DD’ as ConvertedDate;
12. Output: ConvertDate is in string format as ‘2022/01/01’.

Please note that the CONVERT function may have slightly different usage and supported data types in different database management systems. Therefore, when using it, please refer to the documentation of the specific database management system for more detailed information.