I downloaded Oracle's ADO.net connector and added support for it in my database classes. That meant that I could access Oracle databases from my console and WinForms apps, including one that allows the user to enter ad hoc queries and view the schema.
SQLTools[^] if you want it lightweight. TOra[^] is at the other end of the spectrum.
Both are opensource.
SQL Developer and Oracle Developer Tools for Visual Studio has already been mentioned. They are from Oracle and are supported, ... sort of.
You will also need to install some version of the Oracle Client which is available in several versions such as the normal Client, Instant Client or Oracle Data Provider for Dotnet.
Oracle Developer Tools for Visual Studio has the Client built in.
I had a programmer in a foreign country develop an application for me, I had to dismiss him because he would not finish the program on time. I asked him for the source code to MySQL db and he would not provide it. I paid him so that wasn't the issue. I need to move my application from one cloud server to another company and I need help in figuring out how to break the db code to move the application. There are a lot of connection points in and out of the db so I can't just copy the db and move it over.
Lobster Thermidor aux crevettes with a Mornay sauce, served in a Provençale manner with shallots and aubergines, garnished with truffle pate, brandy and a fried egg on top and Spam - Monty Python Spam Sketch
Your string-representation is a culture-dependent format, a way of displaying a date in a specific culture. Date (and time) itself is not a string, but a number.
Make sure it's a DATE column in the database, and pass a Date (not a string) to the query. Use parameters as suggested.
using (var con = new SqlConnection(connectionString))
using (var cmd = con.CreateCommand())
cmd.CommandText = "SELECT * FROM SomeTable WHERE MyDate = @MyDate";
the purpose of a database is to store information, not to format it. Store dates and datetimes in fields with the appropriate type, and let your applications take care of formatting when presenting results to the user. Do not try and have the database format stuff, you will get lots of trouble and never get satisfactory results.
And as others have said, use SQL parameters rather than SQL string concatenation, to feed dates and datetimes to the database; thus avoiding all conflicts with regional settings and the like.