In this guide, we’ll go over how to create tables in SQL, as well as how to modify and delete existing tables. Prerequisites In order to follow this guide, you will need a computer running some type of relational database management system (RDBMS) that uses SQL. The instructions and ex...
Enhance your database querying skills and learn methods to list tables in SQL Server, suitable for both older and newer versions.
In this article, we’re going to show you how to create pivot tables in SQL Server. This is the third article aimed at teaching Excel users some basic SQL server queries, and how to mimic some of the main functions used in Excel. In aprevious articlewe looked at the equivalent of Exce...
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MySQL installed and secured on the server, as outlined inHow To Install MySQL on Ubuntu 20.04. This cheat sheet was verified with a newly-created user, as described inStep 3. Note: Please note that many RDBMSs use their own unique implementations of SQL. Although the commands outlined in th...
Now, we can begin analyzing this SQL query: table1, table2, and table3 are the table names involved in the INNER JOIN column is the common column to both table1 and table2, as well as table2 and table3 columns_list are the columns to retrieve data from the joined tables Overall, th...
You must set up a repository to house the necessary repository tables and PL/SQL packages before you can convert Microsoft SQL Server to Oracle. Follow these steps to achieve this: You can skip these steps if you already have a migration repository and a mwrep orcl connection. Step 1: To...
How to find duplicate values in a SQL table Posted by: Tara Kirkland Generally, it’s best practice to put unique constraints on a table to prevent duplicate rows. However, you may find yourself working with a database where duplicate rows have been created through human error, a bug in ...
These have direct counterparts in SQL: A ∪ B : UNION or UNION ALL (UNION eliminates duplicates, UNION ALL keeps them) A ∩ B : INTERSECT A − B : EXCEPT We can use these to find out some things about our tables: 1 2 3 4 5 SELECT CustId, CustName, CustAddress, Cust...
Writing SQL Queries What might not have become clear from the previous section is that the Garbage In, Garbage Out (GIGO) principle naturally surfaces within the query processing and execution: the one who formulates the query also holds the keys to the performance of your SQL queries. If the...