Oracle to_char mysql cast select * from taxpayer_subject_info f, tax_land_info LEFT JOIN document d ON tax_land_info.doc_id = to_char(d.id AS CHAR)
select * from taxpayer_subject_info f, tax_land_info LEFT JOIN document d ON tax_land_info.doc_id = CAST(d.id AS CHAR) 当有时报字符长度超出范围的时候 可以考虑CAST(d.id AS CHAR(50));
Mysql中
Cast(字段名 as 转换的类型 ),其中类型可以为: CHAR[(N)] 字符型 DATE 日期型 DATETIME 日期和时间型 DECIMAL float型 SIGNED int TIME 时间型
Oracle中
to_char(date,'格式'); to_char(number,'格式'); to_char(salary,'$99,99');