SQL Server Issue

In SQL Server, the question mark (?) is not used as a wildcard character for data retrieval or manipulation. Instead, it is typically used as a placeholder for parameterized queries or prepared statements when working with programming languages or frameworks that support parameterization.

When you use a question mark as a placeholder in a parameterized query, you're essentially telling the database engine to expect a parameter value at that position, and you'll provide the actual value when executing the query. This approach is important for preventing SQL injection attacks, improving performance, and ensuring data integrity.

In SQL Server, if you insert a question mark ('?') within data, it is treated as a regular character and is stored as part of the data in the database. The question mark does not have any special meaning or functionality in terms of SQL Server data storage.

For example, if you execute an SQL query like:

INSERT INTO YourTable (ColumnName) VALUES ('Some? Data')
 
The value 'Some? Data' will be inserted into the specified column without any issue, and the question mark will be stored as part of the data.

However, it's important to note that when constructing SQL queries dynamically or handling user inputs, you should use parameterized queries or input validation to prevent SQL injection attacks. In such cases, the question mark may have a special role as a placeholder for parameters, but it's not related to the data itself.
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In SQL Server, if you insert a question mark ('?') within data (such as a string or a value) in a column, it will be treated as a regular character and will not have any special meaning in terms of SQL syntax or parameterization.

SQL Server uses question marks as placeholders for parameters when you're working with parameterized queries or prepared statements to help prevent SQL injection attacks.

If you insert a question mark ('?') within data in SQL Server, it will generally be treated as a literal character and not as a special SQL symbol. SQL Server uses question marks as placeholders for parameterized queries, but within the actual data stored in tables, a question mark is just a regular character like any other.

Here's an example of inserting a question mark into a SQL Server table:

INSERT INTO MyTable (ColumnName) VALUES ('This is a question?')

In this example, "This is a question?" will be inserted as a string into the ColumnName of the MyTable table.

However, if you're using parameterized queries with placeholders in your SQL statements, the question mark is used to represent a parameter, not as a literal character within the data. Parameterized queries are used to safely pass user input into SQL queries to prevent SQL injection. Here's an example of a parameterized query:

DECLARE @MyParameter NVARCHAR(50)
SET @MyParameter = 'This is a question?'

SELECT * FROM MyTable WHERE ColumnName = @MyParameter

In this case, the question mark is used as a placeholder for the value of @MyParameter, and it is not treated as a literal question mark within the data.

Firstly it insert the data in table.

INSERT INTO Customers(customer_id, first_name, last_name, age, country)
VALUES(9, '?', '?', '?', '?'); after thar These question marks will be populated with values later on, before the query is executed.