understanding insert into statements

Author: techysanoj

insert_into_statements.sql

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+use world;
+
+show tables;
+
+select * from city;
+
+describe city;
+
+create table newCity(ID int primary key auto_increment, Name CHAR(35) NOT NULL, 
+CountryCode CHAR(3) NOT NULL, District CHAR(20) NOT NULL, Population int NOT NULL DEFAULT 0 );
+
+select * from newCity;
+
+-- now inserting the city records into newCity
+insert into newCity
+select * from city; -- for copying all the data
+
+
+-- for copying some data 
+create table newCity1(ID int primary key auto_increment, Name CHAR(35) NOT NULL, CountryCode CHAR(3) NOT NULL);
+
+insert into newCity1
+select id, name, countrycode from city;
+
+select * from newCity1;
+
+-- if we want to do some column when there are multiple column then
+insert into newCity1(id, name)
+select id, name from city; -- this can also be done
+
+
+-- we can also use where clause means we can do anything with the select statement accordingly and then store the data