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Developer-C 11.1
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create table wp_usermeta (first_colum int);
ALTER TABLE wp_usermeta ADD ammountChecking int default 2000;
Insert into wp_usermeta values (2000, 2000);
Insert into wp_usermeta values (1000, null);
select * from wp_usermeta;
first_colum
ammountChecking
2000
2000
1000
null