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sql server script examples query tuning and optimization best practices databases, tables, stored procedures,functions, ssis, ssrs interview questions and answers explanation, errors and solutions, data 3g tariff recharge. complex or multiple tables join best practices sql server performance tuning. how to optimize table join if there are many tables in a join statement in the sql server? how to decrease numbers of tables in a. (sql server).  if data volume is less then performance is not a big concern. but if the data volume is big we must have to consider the most efficient approach. let us discuss different approaches and their advantages and disadvantages: looping over insert statement: one of the easiest ways to write an insert statement inside a loop. and it will populate records one by one in the database. for example: foreach (datarow row in table.rows) {     using (sqlconnection connection = new sqlconnection(connectionstring))         sqlcommand cmd = new sqlcommand(insert into users(name, phone, age) values (@name, @phone, @age));         cmd.commandtype = commandtype.text;         cmd.connection = connection; here the problem with above script is there is separate database call for each row.  for a large volume of records above script will take a in this approach first all insert queries are saved in a string variable. then whole insert statement is executed in the database at using (sqlconnection connection = new sqlconnection(connectionstring))     sqlcommand cmd = new sqlcommand(query);     cmd.commandtype = commandtype.text;     cmd.connection = connection;     connection.open(); in the above approach database is called only one time but inside database rows are being inserted one by one. so it is rows based approach and it is not efficient in case of a large volume of data. in sql server table value constructor is set based approach. and it is very efficient.  instead of the full insert statement, we can save