Database table structure

Database table structure

mysql

SELECT
COLUMN_NAME  Name ,
COLUMN_TYPE  data type ,
DATA_TYPE  Field type ,
CHARACTER_MAXIMUM_LENGTH  length ,
IS_NULLABLE  Is it empty ,
COLUMN_COMMENT  remarks 
FROM
INFORMATION_SCHEMA.COLUMNS
where
-- developerclub For database name , At that time, you only need to modify the database to export the table structure 
table_schema ='chengheDev'
AND
-- article Is the name of the watch , Then change to the name of the table you want to export 
--  If not , Data in all tables will be queried by default , In this way, you may not know which fields are in which table , Therefore, it is recommended to write the name of the to be exported 
table_name = 'sab_b_jointCompany'

oracle

SELECT 
--t1.Table_Name || chr(13) || t3.comments AS " Table name and description ",
     ROWNUM ,
       t1.Column_Name                                AS " Field name ",
       t1.DATA_TYPE             AS " data type ",
             t1.DATA_LENGTH    AS " length ",
       t1.NullAble                                   AS " Is it empty ",
       t2.Comments                                   AS " Field description ",
       t1.Data_Default " The default value is "
       --t4.created AS " Time to build the table "
               --t3.comments AS " Table description ",
  FROM cols t1
  LEFT JOIN user_col_comments t2 
         ON t1.Table_name = t2.Table_name
        AND t1.Column_Name = t2.Column_Name
  LEFT JOIN user_tab_comments t3 
         ON t1.Table_name = t3.Table_name
  LEFT JOIN user_objects t4 
         ON t1.table_name = t4.OBJECT_NAME
  WHERE NOT EXISTS (SELECT t4.Object_Name
          FROM User_objects t4
         WHERE t4.Object_Type = 'TABLE'
           AND t4.Temporary = 'Y'
           AND t4.Object_Name = t1.Table_Name)
                     and t1.TABLE_NAME=' The table name you want to query '
  ORDER BY t1.Table_Name, t1.Column_ID;