mysqlshow full columns from table_name;
hivedesc table_name;
presto desc table_name;
postgresqlSELECT
col_description (A .attrelid, A .attnum) AS COMMENT,
format_type (A .atttypid, A .atttypmod) AS TYPE,
A .attname AS NAME,
A .attnotnull AS NOTNULL
FROM
(SELECT
pg_class.oid,*
FROM
pg_class
INNER JOIN pg_namespace
ON concat(pg_namespace.nspname,’.’,pg_class.relname)= ‘table_name’
AND pg_namespace.oid = pg_class.relnamespace) C,
pg_attribute AS A
WHERE A .attrelid = C .oid
AND A .attnum > 0
oracle/* user_tab_columns：
table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等
all_tab_columns ：
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等
dba_tab_columns：
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等
*/
SELECT
column_name,
comments
FROM
all_col_comments
WHERE
CONCAT (
CONCAT (OWNER, ‘.’),
table_name
) = ‘table_name’
sql server
SELECT 
表名       = case when a.colorder=1 then d.name else '' end,
表说明     = case when a.colorder=1 then isnull(f.value,'') else '' end,
字段序号   = a.colorder,
字段名     = a.name,
标识       = case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
主键       = case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id and name in (
SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then '√' else '' end,
类型       = b.name,
占用字节数 = a.length,
长度       = COLUMNPROPERTY(a.id,a.name,'PRECISION'),
小数位数   = isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
允许空     = case when a.isnullable=1 then '√'else '' end,
默认值     = isnull(e.text,''),
字段说明   = isnull(g.[value],'')
FROM 
syscolumns a
left join 
systypes b 
on 
a.xusertype=b.xusertype
inner join 
sysobjects d 
on 
a.id=d.id  and d.xtype='U' and  d.name<>'dtproperties'
left join 
syscomments e 
on 
a.cdefault=e.id
left join 
sys.extended_properties   g 
on 
a.id=G.major_id and a.colid=g.minor_id  
left join 
 
sys.extended_properties f
on 
d.id=f.major_id and f.minor_id=0
where 
d.name='C_PARTY_SPREADER'    --如果只查询指定表,加上此条件
order by 
a.id,a.colorder
— from
https://bbs.csdn.net/topics/120080672