How To Query Sql Database

How To Query Sql Database – Using the Database Explorer application, you can open one or more database connections at once by clicking Connections on the toolbar. The Database Explorer application creates a Data Source tab for each SQL query.

On each data source tab, you can create an SQL query in one of two ways. If you are unfamiliar with the SQL query language, or just want to explore the data in your database, use the Data Browser pane with the buttons on the toolbar. Or, if you’re already familiar with SQL, enter the SQL query manually. When entering queries, you can use more advanced SQL statements (for example,

How To Query Sql Database

How To Query Sql Database

). You can also enter SQL code that is specific to your database and does not conform to ANSI standards.

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Use these steps as a general workflow to create SQL queries using the buttons on the toolbar.

The application opens a new data source tab and adds a numbering suffix to the tab name. The number is incremented by one for each subsequent data source tab name.

You can also create SQL queries on different catalogs or schemas. Repeat these steps to select another catalog or schema in the Catalogs and Schemas dialog box.

To connect to another database, repeat these steps and select a different data source from the Connections list.

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Execute the command by entering it in the MATLAB command window. Web browsers do not support MATLAB commands.

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How To Query Sql Database

I am working on developing an application that can handle multiple database servers like “MySQL” and “MS SQL Server”.

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I want to get the table names of a specific database using a common query suitable for all database types. I have tried the following:

However, I have given the table names for all the databases on a particular server, but I want to get the table names for the selected database only. How can I restrict this query to retrieve tables from a specific database?

If you want to list all tables in a particular database without using the “use” keyword, you can do this:

If you are using multiple schemas in MS SQL Server, selecting TABLE_NAME without selecting TABLE_SCHEMA at the same time probably won’t help much.

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The above query was tested in SQL Server Management Studio using my SQL Server database and in MySQL Workbench using a MySQL database. In both cases the table name is displayed.

This query combines Michael Bellon’s two separate queries into one that can be run on a database type. The first part of the WHERE clause works for MySQL databases and the second part (after the OR) works for MS SQL Server databases. It’s ugly and a bit logically incorrect because it assumes there are no unwanted schemas with the same name as the database. This can help people looking for a single query that can run on a database server.

Below I show the code in Oracle DB (PL/SQL) which works to get the list of all the tables present in the DB.

How To Query Sql Database

Based on Michael Bellon’s answer, I wanted a list that also contained the schema information. Here’s how I changed his query.

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By clicking “Accept All Cookies”, you consent to Stack Exchange placing cookies on your device and disclosing information in accordance with our Cookie Policy. Welcome to the first article in our SQL learning series. In this part, we start with two important commands in SQL: create database and create table. Both are very simple, but you should use them before you start working with your data (unless you’re using a template database).

The second part of this series covers everything a complete beginner needs to dive into the magical world of SQL and databases. So let’s get started:

The purpose of this article is to create a database (using the SQL Create Database command) and two tables (using the SQL Create Table command) as shown in the image above. In future articles, we will insert data into these tables, update and delete data, as well as add new tables and create queries.

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Before creating a database using the SQL Create database command, I want to define what a database is. Use the definitions provided by Oracle.

A database is an organized collection of structured information or data, usually stored electronically in a computer system. A database is usually managed by a database management system (DBMS).

This article uses Microsoft SQL Server Express Edition. So the DBMS is SQL Server and the language used is T-SQL. I will use the quote again.

How To Query Sql Database

T-SQL (Transact-SQL) is a programming suite by Sybase and Microsoft that adds many features to Structured Query Language (SQL), such as transaction control, exception and error handling, row handling, and declared variables. It is an extension.

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I won’t go into detail in this article, but this statement states that a database is an organized set of tables that contain real-world data and a few additional columns necessary for the proper functioning of the system. This will be covered in future articles.

It’s not fun at all. Create a new database and have more fun. Click on New Query and a new window will open where you can enter something. It should look like the picture below.

Before you type anything, you need to make sure that you are typing it correctly. Since T-SQL is a language, it has a set of rules for how to write various commands.

Fortunately, one of those commands is the SQL create database command. The complete T-SQL Create Database syntax can be found on Microsoft’s page.

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I will keep it very simple and use only the most basic forms. To create a new database on the server, you should use the following command:

If you click the + next to the database folder, you will see that in addition to the two folders, our_first_database is also created.

You have now successfully created your first database. The problem is that nothing is stored inside the database. Let’s change it.

How To Query Sql Database

I love using analogies, so I’ll do that here too. Think of a library: a database is a shelf of books, and each book is a table. Each book has its own content, but it is related in some way to the other books on the bookshelf. That means sharing some properties or just living nearby.

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There are many theories behind database tables and ways to decide what goes where, but the simplest you can do is: you have to look at your data and decide where it should be grouped in the tables so that everything belongs to the same physical entity. Go to the same table.

For example. If you want to store data representing cities and countries, have two separate tables in your database. One for the city and one for the country. Correlate their data instead of mixing it. This is beyond the scope of this article and will be covered in the next part of this series.

To define a table, follow the syntax. You can see the full T-SQL CREATE TABLE syntax here, but once again I’ll simplify the statement.

Select a table name and list all the columns you want to include in this table. Columns are also called attributes, and each column represents a property of a record in the table. A column has a type and you should choose the type based on the expected values ​​for that column (number, text, etc.).

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There is a new limitation here and that is the unique constraint. This indicates that this value must be unique in this table. For example.

The final part of the script is the foreign key definition. There is only one such key and it is associated with the Cities and Countries table (

Keys (primary and foreign) are quite complex and will be covered in a separate article. After running these commands, the database status should look like the image below.

How To Query Sql Database

Congratulations You have successfully created your first database using the SQL Create Database and Create Table commands. There are two tables in the database. Now you are ready to prepare them with data and test if they perform as expected. I will do that in the next article, so leave it as is

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