MySQL VARBINARY with maximum size

I can't set varbinary with maximum size in MySql 8.0

I can't set varbinary with maximum size in MySql 8.0

Show this error message :

Could not set value

Please write correct syntax.

Thanks.

SQL Full Course - SQL Tutorial For Beginners - MySQL Essentials - SQL Training

SQL Full Course - SQL Tutorial For Beginners - MySQL Essentials - SQL Training

This SQL Full Course video will cover all the topics of SQL starting from scratch. This video is great for beginners who want to learn SQL and for advanced people to brush up their skills.


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Storing a value from SQL database to a variable

I tried this code to extract a single value from my database and store it in a variable. But it extracts the value&nbsp;<code>Supplier ID</code>&nbsp;instead of&nbsp;<code>Quantity</code>.

I tried this code to extract a single value from my database and store it in a variable. But it extracts the value Supplier ID instead of Quantity.

string query3 = "SELECT Quantity FROM Supplier WHERE [Supplier ID]='"+supplierid+"'";
SqlCommand cmd3 = new SqlCommand(query3, con);
con.Open();
string temporaryquantity = cmd.ExecuteScalar().ToString();
MessageBox.Show(temporaryquantity);

How can I extract Quantity instead of Supplier ID?