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okay welcome back in this video weamp;#39;re also going to be modifying tables which already exist and weamp;#39;re going to be modifying a columns data type so to modify a columns data type we need to use this sql query here so we type alter table followed by the table name and then we type alter column followed by the column name then we use the word type and then we define the new data type which we want to modify so weamp;#39;re changing changing the data type to this new data type here so letamp;#39;s do that by modifying a columns data type in our examples table so we have the examples table down here and iamp;#39;m going to modify the nationality data type from a varchar 30 to a char three so each country or nationality normally has a three letter abbreviation so for germany it would be g e r for japan it would be jpn so iamp;#39;m going to change the data type from varying from varchar 30 to char with a fixed length of three so to do that i need to type alter table follow