Append table to an existing one: SQL Server

The basic form is: This may not work if, for instance, you have a unique constraint on the columns and the insert violates this constraint. This assumes that you actually want to add the rows to the table. If you just want to see the results together: EDIT: The goal seems to be to add columns one tableB. … Read more

What does * mean in sql?

I am providing you answer by seperating each part of code. SELECT == It orders the computer to include or select each content from the database name(table ) . (*) == means all {till here code means include all from the database.} FROM == It refers from where we have to select the data. example_table … Read more

Difference between EXISTS and IN in SQL?

The exists keyword can be used in that way, but really it’s intended as a way to avoid counting: This is most useful where you have if conditional statements, as exists can be a lot quicker than count. The in is best used where you have a static list to pass: When you have a table in an in statement it makes more sense to use … Read more