SQL is classified into the following categories. Note that statements mentioned in the following tables may vary in different databases. CommandsDescription DDL Data Definition Language DML Data Manipulation Language TCL Transaction Control Language DCL Data Control Language ...
Technique #1: How to find duplicate values in SQL table Identifyingduplicate valuesin a database is essential for maintaining data integrity and accuracy. To find duplicate values in an SQL table, you can utilize the “GROUP BY” and “HAVING” clauses along with aggregate functions. ...
Virtual log file growth In previous versions of SQL Server, if the next growth is more than 1/8 of the current log size, and the growth is less than 64 MB, four VLFs were created. In SQL Server 2022 (16.x), this behavior is slightly different. Only one VLF is created if the grow...
SQL stands for Structured Query Language SQL is a standard language for accessing databases SQL has been an international standard (ISO) since 1987SQL StatementsTo access a database, you use SQL statements.The following SQL statement selects all records in a database table called "Customers":...
Analysis Services projects and SSMS are updated monthly with new and improved features that typically coincide with new functionality in SQL Server. While it's important to learn about all the new features, it's also important to know what is being deprecated and discontinued in this release and...
SQL history To get the most out of the mounds of data they collect, many businesses must become versed in a programming language known as SQL. Here’s everything you should know about using SQL to access and manipulate data. What is SQL? SQL, or Structured Query Language, is a ...
SQL as a domain-specific and declarative language Compared to most established programming languages, SQL is special because it is adomain-specific language(DSL). In contrast to the General Purpose Languages (GPLs), which are suitable for use in many different applications, SQL can only be used...
Simple SQL CASE Example Here is the syntax for the SQLCASEexpression: CASE WHENcondition_1THENresult_1 WHENcondition_2THENresult_2 ELSEelse_result END In this syntax, SQLCASEmatches the value with eithercondition_1orcondition_2. If a match is found, the statement will return the corresponding...
What is distinct count in SQL? The COUNT DISTINCT and COUNT UNIQUE functions return unique values. The COUNT DISTINCT functionreturns the number of unique values in the column or expression, as the following example shows. ... If the COUNT DISTINCT function encounters NULL values, it ignores th...
Before we start building SQL statements in SQL Server, we need to understand what the basic parts of a statement are. Overall, a “statement” is something you write in SQL to get an answer from a database or to make a change to it. ...