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...
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....
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.
Overview Quickstarts Connect with SQL Server Management Studio Connect and query SQL Server Connect and query SQL Server on Azure VM Connect and query Azure SQL Database Connect and query a dedicated SQL pool in Azure Synapse Analytics Tutorials Concepts How-to References Resources Download PDF Learn...
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 articlesAccess SQL: basic concepts, vocabulary, and syntaxandHAVING ...
The following examples create a new database in the serverless compute tier. Use Azure portal See Quickstart: Create a single database in Azure SQL Database using the Azure portal. Use PowerShell General Purpose Hyperscale Create a new serverless General Purpose database with the following Power...
Granular permission examples Create schema to contain user tables: SQL CREATESCHEMAData; GO Create table with masked columns: SQL CREATETABLEData.Membership ( MemberIDINTIDENTITY(1,1)NOTNULLPRIMARYKEYCLUSTERED, FirstNameVARCHAR(100) MASKEDWITH(FUNCTION='partial(1, "xxxxx", 1)')NULL, LastNameVARCHAR...
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 - ...
Concepts: index fragmentation and page density What isindex fragmentationand how it impacts performance: In B-tree (rowstore) indexes, fragmentation exists when indexes have pages in which the logical ordering within the index, based on the key values of the index, does not match the physical ord...