Sq常用操作

CREATE TABLE mytable(
    id varchar(40) NOT NULL default ‘‘,
    userId varchar(40) NOT NULL default ‘‘
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE info_aaaa ENGINE=InnoDB;

show table status from [DBNAME];

CREATE DATABASE `test2` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

show create table user;

?useUnicode=true&characterEncoding=UTF-8

ALTER TABLE test_sub ADD CONSTRAINT main_id_cons FOREIGN KEY (main_id) REFERENCES test_main;

alter table tableName add columnName varchar(30)  

alter table tableName alter column columnName varchar(4000)  

EXEC  sp_rename   ‘tableName.column1‘ , ‘column2‘  (把表名为tableName的column1列名修改为column2) 

alter table tableName drop column columnName