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SQL查询表字段信息详细图文教程

作者:王林-wlin

最近工作用到SQL语句查询表中所有字段的名称,下面这篇文章主要给大家介绍了关于SQL查询表字段信息的相关资料,文中通过代码介绍的非常详细,需要的朋友可以参考下

一、MySQL

(一)查询所有表名

查询指定数据库下表名

select table_name,table_comment from information_schema.tables where table_schema='grandly_forum_db'

在这里插入图片描述

(二)查询表下所有字段

查询指定数据库下表的字段信息

select 
a.table_schema,
a.table_name,
b.table_comment 表说明,
a.COLUMN_NAME 字段名,
a.column_comment 字段说明,
a.column_type 字段类型,
a.column_key 约束 from  information_schema.columns a
join information_schema.TABLES b on a.table_name = b.TABLE_NAME
where a.table_schema = '数据库名'
and a.table_name = '表名';

二、Oracle

(一)查询表下所有字段

SELECT
DISTINCT
c.owner 用户,
c.table_name 英文表名 ,
t.comments 中文表名称,
cc.column_name 字段名,
cc.comments 字段注释 ,
c.data_type || '(' || c.data_length || ')' 字段类型及长度
from
dba_tab_columns c
join dba_col_comments cc on c.table_name = cc.table_name
and c.column_name = cc.column_name
join dba_tab_comments t on c.table_name = t.table_name
where 
c.owner = 'YZZX'
-- AND t.comments like '%船舶信息%'
AND c.table_name =  'SHX_SHIPCERT'
order BY
cc.column_name 

(二)查询库下表字段信息

with t1 as(
SELECT
 t.OWNER owner_name,
 t.table_name,
 t.column_name,
 f.comments,
 t.data_type,
 t.data_length
FROM all_tab_columns t 
JOIN all_col_comments f ON t.table_name = f.table_name AND t.column_name = f.column_name
ORDER BY 
t.table_name,
t.column_name
),
t2 as (
select col.column_name pk,col.table_name
from user_constraints con,user_cons_columns col
where
con.constraint_name=col.constraint_name and con.constraint_type='P'
)

select 
distinct 
t1.owner_name 用户名,
t1.table_name 表名,
t2.pk 主键,
t1.column_name 字段名,
t1.comments 字段注释,
t1.data_type 数据类型,
t1.data_length 长度
from t1
join t2 on t1.table_name = t2.table_name
where t1.owner_name = 'ZHZFHZK' and t1.comments is not null
order by t1.table_name,column_name

(三)查询用户下表的外建等信息

 select distinct 
 c.owner 用户名,
 CONSTRAINT_TYPE 键类型,
 c.TABLE_NAME 子表名,
 c.CONSTRAINT_NAME 子表键名称,
 d.TABLE_NAME 父表名称,
 c.R_CONSTRAINT_NAME 父表键名称,
 d.COLUMN_NAME 字段名称
 from all_constraints c 
  join all_cons_columns d on c.constraint_type = 'R' and c.R_CONSTRAINT_NAME = d.CONSTRAINT_NAME
 where c.owner = 'SCOTT' ;

(四)oracle查询用户下表外建信息

SELECT
    t1.table_name AS table_name,
    t2.table_name AS f_table_name,
    t1.column_name,
    t2.column_name as f_column_name
FROM
    all_constraints cons
    JOIN all_cons_columns col1 ON cons.owner = col1.owner AND cons.constraint_name = col1.constraint_name
    JOIN all_tab_columns t1 ON cons.owner = t1.owner AND col1.table_name = t1.table_name AND col1.column_name = t1.column_name
    JOIN all_cons_columns col2 ON cons.owner = col2.owner AND cons.r_owner = col2.owner AND cons.r_constraint_name = col2.constraint_name
    JOIN all_tab_columns t2 ON cons.r_owner = t2.owner AND col2.table_name = t2.table_name AND col2.column_name = t2.column_name
WHERE
   cons.constraint_type = 'R' AND t1.owner = 'WANGLIN'
ORDER BY t1.table_name;

三、Sql Server

查询数据库(Databases)名称: 

SELECT name FROM master.dbo.sysdatabases WHERE status <> 512

查询数据表(Tables)名称:

SELECT name FROM dbo.sysobjects WHERE OBJECTPROPERTY(id,N'IsUserTable') = 1 AND name <> 'dtproperties'

查询带Schema 的数据表(Tables)名称:

SELECT b.name + '.' + a.name AS name FROM sysobjects a INNER JOIN sys.schemas b ON a.uid=b.schema_id WHERE OBJECTPROPERTY(id,N'IsUserTable') = 1 AND a.name <> 'dtproperties'

查询数据表(Tables)中的字段(Columns)名称:

SELECT * FROM dbo.syscolumns WHERE id=OBJECT_ID(N'[Production].[Product]') ORDER BY colid

或者

Select name from syscolumns Where ID=OBJECT_ID('tName') 

总结 

到此这篇关于SQL查询表字段信息的文章就介绍到这了,更多相关SQL查询表字段信息内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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