One point that a lot of people seem to miss is that a DBMS will often (or can only) only use one index per table reference in a query, and if it can and does use multiple indexes it would probably be faster to use a combined index if present. For instance, if searching a large ...
OK, so now we have data and it is accessible. Is this sufficient? No, not yet. You need people with the right skills to use that data. That can mean the mechanics of filtering and aggregating data, such as through a query language or Excel macros, but it also means people who design...
Query the catalog: if a data catalog is powered by a true knowledge graph, you should be able to query all your metadata. If you can’t, then your data catalog isn’t powered by a knowledge graph.In this post I will get into the technical details of what those three points ...
0 what does the @@ means in MSSQL when used in @@AnyExpression 16 Meaning of the Symbol @@ in SQL Server 1 Unsure what a special variable means in Proc SQL in SAS 2 What is the return value of @@ProcId in an ad-hoc SQL query? Hot Network Questions Why does Voyager use c...
1 What does ‘?’ stand for in SQL? 0 What is the difference between queries and questions in mysql 1 What does = ? mean in H2 / SQL Database Query 3 What is this "SELECT TRUE" MySQL syntax doing? 1 Purpose of Mybatis 1 What is the mybatis sql variable syntax for literals...
What does DNS Mean The DNS goes by many names, including name server, domain name system server, and nameserver. Regardless of which name is used, all describe the process of making domain names alphabetical. DNS also refers to the hierarchical system used to search through the network of mil...
If someone knows more, please do fill in the gaps. TL;DR "Sending data" seems to mean we are sending data about the query to the function that gathers that information together. It is NOT sending data to the MySQL or MariaDB client. This probably has something to do with the assembly...
While the users handle schema definitions and query tuning, the cloud database providers take care of minor version updates and major upgrades. However, not all providers are prompt with upgrades; some can fall years behind. For example, one major Postgres DBaaS provider was nearly...
What Does Query String Mean? A query string is the portion of a URL where data is passed to a web application and/or back-end database. The reason we need query strings is that the HTTP protocol is stateless by design. For a website to be anything more than a brochure, you need ...
User requests information from web site (front-end) that requires the web server to query a SQL database(back-end) Access to this data is authorized according to who accessed thefront-end In this case, the web service must impersonateuser1when making the request to SQL ...