Golang how can I check for errors using the sql query row

I am using postgres database and am returning a Json response from the database in the form of a string which is used for an API . My problem is that I do not know how to check for errors using the QueryRow Method . This right here is my code and it works correctly. That just shows a Json response . However I have a custom function that I would like to use if there is some error with the code and QueryRow does not let me check for errors any suggestions ?

 var result string
 db.QueryRowContext(ctx,"select json_build_object('Profile', array_to_json(array_agg(t))) from" +
					" (select p.id,p.fullname,z.thirtylatmin as latmin,z.thirtylatmax as latmax,z.thirtylonmin as lonmin," +
				          "z.thirtylonmax as lonmax,p.latitudes,p.longitudes,p.location as location" +
					",p.picture,p.is_gold from profiles p join zips z on (z.city='Boston' " +
				 "and z.state='MA') where email=$1) t;",email).Scan(&result)

io.writestring(w, result)

If I change the above code to this then it works with the error message however how can I return that in a String

SqlStatement,err := db.QueryContext(ctx,"select json_build_object('Profile', array_to_json(array_agg(t))) from" +
				" (select p.id,p.fullname,z.thirtylatmin as latmin,z.thirtylatmax as latmax,z.thirtylonmin as lonmin," +
			          "z.thirtylonmax as lonmax,p.latitudes,p.longitudes,p.location as location" +
				",p.picture,p.is_gold from profiles p join zips z on (z.city='Boston' " +
			 "and z.state='MA') where email=$1) t;",email)
			
			if err != nil {
				log_errors("sql statement error",err.Error(),w)
			}
			io.WriteString(w, "How can I get SqlStatement as 1 whole String ??")

The statement above lets me log any errors and insert it into the database, now how can I get SqlStatement to return as 1 whole string ? The SQL statement returns perfectly now I just need to get it into io.WriteString in a String format

You should just check return value of Row.Scan method, just like this:

row := db.QueryRow(
	`SELECT 
		json_build_object('Profile', array_to_json(array_agg(t))) 
	FROM
		(
			SELECT 
				p.id,
				p.fullname,
				z.thirtylatmin as latmin,
				z.thirtylatmax as latmax,
				z.thirtylonmin as lonmin,
				z.thirtylonmax as lonmax,
				p.latitudes,
				p.longitudes,
				p.location as location,
				p.picture,
				p.is_gold 
			FROM 
				profiles p 
			JOIN zips z on (z.city='Boston'AND z.state='MA') 
			WHERE 
				email=$1
		) t`,
	email,
)

var result string
if err := Scan(&result); err != nil {
	log.Fatal(err)
}

fmt.Fprint(w, result)