* T-SQL: This is a structured query language (SQL) dialect used by Microsoft SQL Server.
* PL/SQL: This is a procedural extension to SQL used by Oracle databases.
* Transact-SQL (T-SQL): This is a proprietary extension to SQL used by Microsoft SQL Server.
Input in SQL-based languages (like T-SQL or PL/SQL):
In these languages, "input" generally refers to data provided to the database in various ways:
* User Input: This comes from users interacting directly with the database, often through applications that use SQL commands.
* Stored Procedures: Procedures can accept input parameters, allowing you to pass data to them during execution.
* Functions: Similar to procedures, functions can take input arguments and perform calculations or operations.
* Triggers: Triggers can be activated by events like INSERT, UPDATE, or DELETE statements, and may access data from the triggered event.
* Data Import: You can import data from external sources like files or other databases using specific import commands.
Example (T-SQL):
```sql
-- This stored procedure accepts a customer ID as input
CREATE PROCEDURE GetCustomerInfo (@CustomerID int)
AS
BEGIN
-- Retrieve customer information based on the provided input
SELECT FirstName, LastName, Email
FROM Customers
WHERE CustomerID = @CustomerID;
END;
```
To understand input more specifically, please tell me:
* Which database system are you working with? (SQL Server, Oracle, etc.)
* What specific task or functionality are you trying to understand?
I'll be able to give you a more precise and relevant answer based on your context.