How do I get the oldest entry in SQL?

How do I get the oldest entry in SQL?

Oldest or Most Recent records relative to another field

1. SELECT user_id, MAX(created_at) FROM orders GROUP BY user_id.
2. SELECT users. username, latest_orders.
3. SELECT orders.
4. SELECT holding_value_stamps.
5. SELECT holding_value_stamps1.
6. HoldingValueStamp.

How do you say not null in SQL?

Let’s look at an example of how to use the IS NOT NULL condition in a SELECT statement in SQL Server. For example: SELECT * FROM employees WHERE last_name IS NOT NULL; This SQL Server IS NOT NULL example will return all records from the employees table where the last_name does not contain a null value.

How do I get last second record in SQL?

Here is the query to get the second last row of a table in MySQL. mysql> select *from secondLastDemo order by StudentId DESC LIMIT 1,1; The output displays the second last record.

When to join only the most recent row in a table?

There is an additional table customer_data that stores a historical record of the changes made to the customer, i.e. when there’s a change made a new row is inserted. In order to display the customer information in a table, the two tables need to be joined, however only the most recent row from customer_data should be joined to the customer table.

How to join only the latest record in SQL Server?

Select a.*, b.* — Use explicit column list rather than * here From [Table A] a Inner Join ( — Use Left Join if the records missing from Table B are still required Select *, ROW_NUMBER () OVER (PARTITION BY TableAID ORDER BY RowDate DESC) As _RowNum From [Table B] ) b On b.TableAID = a.ID Where b._RowNum = 1

How to find the oldest record in a table?

A common query that crops up in web apps is finding the oldest or the most recent record in a single table. This is straightforward in SQL. You can even write the relevant part of the query without knowing anything about the table (other than the fact that it has a timestamp column called created_at ):

How to join only the first row in Postgres?

We’ve used Postgres’ DISTINCT ON syntax to easily query for only one widget per user_id. If your database doesn’t support something like DISTINCT ON, you have two options: In our example, the most recent row always has the highest id value. This means that even without DISTINCT ON, we can cheat with our nested subqueries like this: