kk Blog —— 通用基础

show full columns from tablename;

show full fields from tablename;

select COLUMN_NAME 列名, DATA_TYPE 字段类型, COLUMN_COMMENT 字段注释
	from INFORMATION_SCHEMA.COLUMNS
		Where table_name = 'companies'##表名
			AND table_schema = 'testhuicard'##数据库名
			AND column_name LIKE 'c_name'##字段名

show  create  table  tablename;

alter table test1 comment '修改后的表的注释';

alter table test1 modify column field_name int comment '修改后的字段注释';