There are four basic types of data queries in SQL: SELECT: This statement asks the database to return a specified result set of data; you use this to retrieve information that is stored in your ...

SQL tutorial: Learn SQL on PostgreSQL. how-to. Oct 8, 2018 14 mins. ... The count function, one of many aggregates available in SQL, can tell us, without generating lots of output: ...

Learn how to master the SELECT statement to form truly useful data queries. This article explains functions, clauses, and keywords that will make your life a lot easier.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

Assuring optimal performance of database applications starts with coding properly formulated SQL. Poorly written SQL and application code is the cause of most performance problems. As much as 75% of ...

In this Microsoft SQL Server and JDBC tutorial, you'll learn how to connect to a Microsoft SQL Server in Java using JDBC. The steps are relatively straightforward: Each database is different, so ...

SQL Basics, Operating on Data in SQL, Creating Tables in SQL, and eight other interactive SQL courses. Some courses have free test drives, after which there may be a fee. There are seven ...

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SQL basics. If you’ve just learned Java and you’re currently reeling from the ordeal, don’t worry. SQL is not a full programming language in the same sense as Java. ... SQL syntax. So, ...