Oracle CONCAT Datetime - SQL

Oracle's CONCAT function can be used to concatenate two or more strings. In addition to strings, it can also be used to concatenate other data types, such as dates and timestamps.

Concatenating Dates and Timestamps

To concatenate dates or timestamps in Oracle, you can use the TO_CHAR function to convert them to strings, and then use the CONCAT function to join them together.

For example, if you have a column called order_date that contains the date of an order, and a column called order_time that contains the time of the order, you can concatenate them into a single string using the following query:

SELECT CONCAT(TO_CHAR(order_date, 'YYYY-MM-DD'), ' ', TO_CHAR(order_time, 'HH24:MI:SS'))
FROM orders;

This will return a string in the format YYYY-MM-DD HH24:MI:SS, which represents the date and time of each order.

Adding a Separator

You can also add a separator between the date and time by including it as part of the string in the CONCAT function. For example, to include a colon between the time components, you can modify the query as follows:

SELECT CONCAT(TO_CHAR(order_date, 'YYYY-MM-DD'), ' ', TO_CHAR(order_time, 'HH24:MI'), ':', TO_CHAR(order_time, 'SS'))
FROM orders;

This will return a string in the format YYYY-MM-DD HH24:MI:SS, with a colon between the minutes and seconds.

Conclusion

In conclusion, using Oracle's CONCAT function with dates and timestamps can be a powerful tool for combining information from multiple columns into a single string. By converting the date and time values to strings using the TO_CHAR function, you can format them in any way you like, and then use CONCAT to join them together into a single string.