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SQL Advance Tutorial
SQL Triggers
SQL Server triggers are special kind of Stored Procedures that invokes whenever a special event in the database occurs.
SQL Server uses two virtual tables INSERTED and DELETED, whenever a trigger is called . These table is used to capture the data of the modified row before and after the event occurs tables , these tables are called as magic tables or virtual tables.
SQL DML AFTER TRIGGER
After Trigger (using FOR/AFTER CLAUSE)
This type of trigger fires after SQL Server finishes the execution of the action successfully that fired it.
SQL STUFF
SQL STUFF() function is used to delete a sequence of given length of characters from a string and inserting the given sequence of characters from the specified starting index.
Syntax
STUFF(String, Start, Length, Newstring)
String – It is the string to be modified.
Start – The starting index from where the given length of characters will be deleted and new sequence of characters will be inserted.
Length -The number of characters to delete from string
SQL TRANSLATE()
The SQL TRANSLATE() is a string function that is used to replaces a sequence of characters in a string with another sequence of characters.
The function replaces a single character at a time. Until SQL Server 2016, we used use REPLACE() function to replace each character.
SQL SPACE
SQL SPACE() is a string function that replicates the number blanks that we want add to the given string.
Syntax
SPACE(number)
CREATE DATABASE
Database in SQL Server is a collection of tables that stores a specific set of structured data. You can eaisly interact with data such as you can Select, Update and Delete the data in tables.
How to check if User table or Temp table exists in database?
How to check if User table or Temp table exists in database?
SQL DATENAME()
The DATENAME() function returns a string, navarchar type, that represents a specified date part of date ,it can be a day , month ,year or time of specific date.
SQL DATEFROMPARTS
SQL DATEFROMPARTS() function is a date function that returns a date value that maps to a year, month, and day values.
SQL CASE STATEMENT
The CASE statement has the functionality of an IF-THEN-ELSE . It goes through conditions and returns a value when the first condition is met . So, once a condition is true, it will stop reading and return the result.
Schedule a Job in SQL
The SQL Server Agent job is the specified action or series of actions that the SQL Server Agent will execute at any specific date time.
SQL LIKE CLAUSE
The SQL LIKE clause is used to match a value to a similar values using wildcard operators. It is used with Where Clause.
There are two type of wildcards used in conjunction with the LIKE operator.
The percent sign (%) that is used to represent zero , one, or multiple characters.
The underscore (_) that is used to represent a single number or character.
USER DEFINED FUNCTIONS
SQL Server allows us to create our functions called as user defined functions in SQL Server.
How to display Cumulative total in SQL ?
A Cumulative total or running total refers to the sum of values in all cells of a column that precedes the next cell in that particular column
What is Correlated Subquery in SQL?
A correlated subquery is a subquery that uses the values of the outer query and it is evaluated for each row processed by the outer query
A correlated subquery always depends on outer query for its value. Because of this dependency, a correlated subquery cannot be executed independently as a simple subquery .
What is SubQuery in SQL ?
A Subquery is a query within another query. The outer query is called as main query and inner query is called as sub query.