Verify if a record exist to a given ID

Hello everyone!

I am facing a problem here that may be easy to solve. I have a query to add lines to a table. This query is executed every 3 hours, but when it is going to be executed, i want to know if that ID already have these records, if it doesn`t, add, if it does, skip. How can I do it?

this is the ddl

use [mydb]

IF NOT EXISTS (SELECT * 
           FROM sys.objects 
           WHERE object_id = OBJECT_ID(N'table_info') 
           AND type in (N'U'))
BEGIN

CREATE TABLE dbo.table_info (
	id [int] IDENTITY NOT NULL, 	
	project_id INTEGER NOT NULL, 
	document_type NVARCHAR(100) NOT NULL,
	document_location NVARCHAR(100),	
	
	PRIMARY KEY (ID)
)
		
		
END

to add the data, I did this:

DECLARE @1 VARCHAR(100) = 'Info 1'
DECLARE @2 VARCHAR(100) = 'Info 2'
DECLARE @3 VARCHAR(100) = 'Info 3'
DECLARE @4 VARCHAR(100) = 'Info 4'
DECLARE @5 VARCHAR(100) = 'Info 5'

DECLARE @TempTab TABLE (id INT IDENTITY, project INT)
INSERT INTO @TempTab (project) SELECT id FROM mydb.dbo.project_id

DECLARE @QtTab INT, @CurCode INT = 1, @TabName VARCHAR(100) = 'mydb.dbo.table_info'
SELECT @QtTab = COUNT(*) FROM @TempTab

While @CurCode <= @QtTab
Begin
	DECLARE @Proj int = (SELECT project FROM @TempTab WHERE id = @CurCode)
	EXEC ('INSERT INTO ' + @TabName + ' (project_id, document_type, document_location) values 
					(' + @Proj + ', '  + '''' + @1 + '''' + ', ' + '''' + @1  + '''' + ' ),
					(' + @Proj + ', '  + '''' + @2 + '''' + ', ' + '''' + @2  + '''' + ' ),
					(' + @Proj + ', '  + '''' + @3 + '''' + ', ' + '''' + @3  + '''' + ' ),
					(' + @Proj + ', '  + '''' + @4 + '''' + ', ' + '''' + @4  + '''' + ' ),
					(' + @Proj + ', '  + '''' + @5 + '''' + ', ' + '''' + @5  + '''' + ' )					
					)
	Set @CurCode += 1
End

If I run this, every project will receive all the time the new lines, I need it to add only if these doesn`t exist.

How can I do this?