This is one of a set of articles about Access SQL. This article describes the basic use of SQL to select data, and uses examples to illustrate SQL syntax. What is SQL? SQL is a computer language for working with sets of facts and the relationships between them. Relational data...
If you want to become familiar with SQL Developer concepts before using the interface, read the rest of this chapter before proceeding to the next step. Create at least one database connection (or import some previously exported connections), so that you can view and work with database objects...
This topic covers the main Oracle SQL Developer concepts, and explains how to use the major SQL Developer features.
Chapter 8, “Error Handling and Built-In Exceptions,” Chapter 9, “Exceptions,” and Chapter 10, “Exceptions: Advanced Concepts,” contain detailed explanations of the exception-handling section. You have seen examples of the declaration section, executable section, and exception-handling section....
Applications developed in PL/SQL are secured and support object-oriented concepts. PL/SQL can develop robust applications. It has default packages in SQL. It supports the variable declaration within the blocks. These variables are utilized during the processing of the query. ...
We focused on covering essential concepts of SQL, like the basics of SQL queries, joins, subqueries, indexing, and performance optimization. Whether you are a beginner or an expert, understanding these topics will help you confidently handle SQL interviews. If you want to know how data analysis...
Important: If a field is used with an aggregate function, you cannot specify criteria for that field in a WHERE clause. Instead, you use a HAVING clause to specify criteria for aggregated fields. For more information, see the articles Access SQL: basic concepts, vocabulary, and syntax and ...
The following concepts are useful in understanding the behavior of SQL Server for side-by-side instances of SQL Server. The standard product version format for SQL Server is MM.nn.bbbb.rr, where each segment is defined as: MM - Major version nn - Minor version bbbb - Build number rr - ...
In previous issues, I talked about various concepts and looked at many examples of database design to help you ensure the databases you design and develop are useful and meet the needs of the people they serve. Now let's pull together some of these concepts, the four database integrities,...
Key terms and concepts The following key terms and concepts are associated with columnstore indexes. Columnstore A columnstore is data that's logically organized as a table with rows and columns, and physically stored in a column-wise data format. Rowstore A rowstore is data that's logically org...