PostgreSQL“DESCRIBE TABLE”

postgresql psql table-structure

1053066 观看

19回复

9675 作者的声誉

你如何DESCRIBE TABLE在PostgreSQL中使用相应的Oracle (使用psql命令)?

作者: Mr. Muskrat 的来源 发布者: 2008 年 9 月 20 日

回应 (19)


35

9675 作者的声誉

psql的当量DESCRIBE TABLE\d table

有关更多详细信息,请参阅PostgreSQL手册的psql部分。

作者: Mr. Muskrat 发布者: 20.09.2008 08:49

48

2517 作者的声誉

您可以使用psql斜杠命令执行此操作:

 \d myTable describe table

它也适用于其他对象:

 \d myView describe view
 \d myIndex describe index
 \d mySequence describe sequence

资料来源:faqs.org

作者: devinmoore 发布者: 20.09.2008 08:49

2640

61776 作者的声誉

决定

试试这个(在psql命令行工具中):

\d+ tablename

有关详细信息,请参阅手册

作者: Chris Bunch 发布者: 20.09.2008 08:50

680

210625 作者的声誉

除了PostgreSQL方式(\ d'thing'或\ dt'table'或\ ds'sequence'等等)

SQL标准的方式,如图所示在这里

select column_name, data_type, character_maximum_length
from INFORMATION_SCHEMA.COLUMNS where table_name = '<name of table>';

它受到许多数据库引擎的支持。

作者: Vinko Vrsalovic 发布者: 20.09.2008 08:51

66

2916 作者的声誉

如果要从查询而不是psql获取它,可以查询目录模式。这是一个执行该操作的复杂查询:

SELECT  
    f.attnum AS number,  
    f.attname AS name,  
    f.attnum,  
    f.attnotnull AS notnull,  
    pg_catalog.format_type(f.atttypid,f.atttypmod) AS type,  
    CASE  
        WHEN p.contype = 'p' THEN 't'  
        ELSE 'f'  
    END AS primarykey,  
    CASE  
        WHEN p.contype = 'u' THEN 't'  
        ELSE 'f'
    END AS uniquekey,
    CASE
        WHEN p.contype = 'f' THEN g.relname
    END AS foreignkey,
    CASE
        WHEN p.contype = 'f' THEN p.confkey
    END AS foreignkey_fieldnum,
    CASE
        WHEN p.contype = 'f' THEN g.relname
    END AS foreignkey,
    CASE
        WHEN p.contype = 'f' THEN p.conkey
    END AS foreignkey_connnum,
    CASE
        WHEN f.atthasdef = 't' THEN d.adsrc
    END AS default
FROM pg_attribute f  
    JOIN pg_class c ON c.oid = f.attrelid  
    JOIN pg_type t ON t.oid = f.atttypid  
    LEFT JOIN pg_attrdef d ON d.adrelid = c.oid AND d.adnum = f.attnum  
    LEFT JOIN pg_namespace n ON n.oid = c.relnamespace  
    LEFT JOIN pg_constraint p ON p.conrelid = c.oid AND f.attnum = ANY (p.conkey)  
    LEFT JOIN pg_class AS g ON p.confrelid = g.oid  
WHERE c.relkind = 'r'::char  
    AND n.nspname = '%s'  -- Replace with Schema name  
    AND c.relname = '%s'  -- Replace with table name  
    AND f.attnum > 0 ORDER BY number
;

它非常复杂,但它确实向您展示了PostgreSQL系统目录的强大功能和灵活性,并且可以帮助您实现pg_catalog掌握;-)。请务必更改查询中的%s。第一个是Schema,第二个是表名。

作者: Gavin M. Roy 发布者: 22.09.2008 11:39

21

211 作者的声誉

您可以\d *search pattern * 使用星号来查找与您感兴趣的搜索模式匹配的表格。

作者: Ryan 发布者: 30.05.2013 04:20

13

164 作者的声誉

你可以用这个:

SELECT attname 
FROM pg_attribute,pg_class 
WHERE attrelid=pg_class.oid 
AND relname='TableName' 
AND attstattarget <>0; 
作者: YATK 发布者: 05.12.2013 06:55

14

2384 作者的声誉

除了\d+ <table_name>您已经找到的命令行之外,您还可以使用info_schema.columns使用信息模式来查找列数据。

SELECT *
FROM info_schema.columns
WHERE table_schema = 'your_schema'
AND table_name   = 'your_table'
作者: Mushahid Khan 发布者: 25.02.2016 08:03

12

379 作者的声誉

使用以下SQL语句

SELECT DATA_TYPE 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE table_name = 'tbl_name' 
AND COLUMN_NAME = 'col_name'

如果替换tbl_name和col_name,它将显示您要查找的特定列的数据类型。

作者: Mr.Tananki 发布者: 05.05.2016 08:00

3

385 作者的声誉

您也可以使用以下查询进行检查

Select * from schema_name.table_name limit 0;

示例:我的表有2列名称和密码。给出截图如下。

添加图片

*使用PG admin3

作者: Riya Bansal 发布者: 12.12.2016 12:27

1

188 作者的声誉

Use this command 

\d table name

like 

\d queuerecords

             Table "public.queuerecords"
  Column   |            Type             | Modifiers
-----------+-----------------------------+-----------
 id        | uuid                        | not null
 endtime   | timestamp without time zone |
 payload   | text                        |
 queueid   | text                        |
 starttime | timestamp without time zone |
 status    | text                        |
作者: Usman Yaqoob 发布者: 20.07.2017 01:22

2

262 作者的声誉

描述表的最佳方式,例如列,类型,列的修饰符等。

\d+ tablename or \d tablename
作者: Guardian 发布者: 06.08.2017 03:25

-2

1 作者的声誉

/ dt是commad,它列出了数据库中存在的所有表。使用
/ d命令和/ d +我们可以获得表的详细信息。sysntax将类似于
* / d table_name(或)\ d + table_name

作者: Pavan Teja 发布者: 09.08.2017 06:03

7

85 作者的声誉

查询的这种变化(如在其他答案中所解释的)对我有用。

SELECT
 COLUMN_NAME
FROM
 information_schema.COLUMNS
WHERE
 TABLE_NAME = 'city';

这里详细介绍:http//www.postgresqltutorial.com/postgresql-describe-table/

作者: codeUrDream 发布者: 14.02.2018 01:46

-4

56 作者的声誉

我为get表架构制定了以下脚本。

'CREATE TABLE ' || 'yourschema.yourtable' || E'\n(\n' ||
array_to_string(
array_agg(
'    ' || column_expr
)
, E',\n'
) || E'\n);\n'
from
(
SELECT '    ' || column_name || ' ' || data_type || 
coalesce('(' || character_maximum_length || ')', '') || 
case when is_nullable = 'YES' then ' NULL' else ' NOT NULL' end as column_expr
FROM information_schema.columns
WHERE table_schema || '.' || table_name = 'yourschema.yourtable'
ORDER BY ordinal_position
) column_list;
作者: paulg 发布者: 23.03.2018 12:02

6

159 作者的声誉

MySQL中,DESCRIBE table_name


PostgreSQL中,\ d table_name


或者,您可以使用此长命令:

SELECT
        a.attname AS Field,
        t.typname || '(' || a.atttypmod || ')' AS Type,
        CASE WHEN a.attnotnull = 't' THEN 'YES' ELSE 'NO' END AS Null,
        CASE WHEN r.contype = 'p' THEN 'PRI' ELSE '' END AS Key,
        (SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid), '\'(.*)\'')
                FROM
                        pg_catalog.pg_attrdef d
                WHERE
                        d.adrelid = a.attrelid
                        AND d.adnum = a.attnum
                        AND a.atthasdef) AS Default,
        '' as Extras
FROM
        pg_class c 
        JOIN pg_attribute a ON a.attrelid = c.oid
        JOIN pg_type t ON a.atttypid = t.oid
        LEFT JOIN pg_catalog.pg_constraint r ON c.oid = r.conrelid 
                AND r.conname = a.attname
WHERE
        c.relname = 'tablename'
        AND a.attnum > 0

ORDER BY a.attnum
作者: MisterJoyson 发布者: 10.04.2018 08:53

1

68 作者的声誉

In postgres \d is used to describe the table structure.
e.g. \d schema_name.table_name;
this command will provide you the basic info of table such as, columns, type and modifiers.

If you want more info about table use
\d+ schema_name.table_name;
this will give you extra info such as, storage, stats target and description
作者: meenal 发布者: 18.06.2018 09:14

5

86 作者的声誉

为了改进其他答案的SQL查询(这很棒!),这里是一个修改过的查询。它还包括约束名称,继承信息以及分解为组成部分(类型,长度,精度,比例)的数据类型。它还会过滤掉已删除的列(数据库中仍存在这些列)。

SELECT
    n.nspname as schema,
    c.relname as table,
    f.attname as column,  
    f.attnum as column_id,  
    f.attnotnull as not_null,
    f.attislocal not_inherited,
    f.attinhcount inheritance_count,
    pg_catalog.format_type(f.atttypid,f.atttypmod) AS data_type_full,
    t.typname AS data_type_name,
    CASE  
        WHEN f.atttypmod >= 0 AND t.typname <> 'numeric'THEN (f.atttypmod - 4) --first 4 bytes are for storing actual length of data
    END AS data_type_length, 
    CASE  
        WHEN t.typname = 'numeric' THEN (((f.atttypmod - 4) >> 16) & 65535)
    END AS numeric_precision,   
    CASE  
        WHEN t.typname = 'numeric' THEN ((f.atttypmod - 4)& 65535 )
    END AS numeric_scale,       
    CASE  
        WHEN p.contype = 'p' THEN 't'  
        ELSE 'f'  
    END AS is_primary_key,  
    CASE
        WHEN p.contype = 'p' THEN p.conname
    END AS primary_key_name,
    CASE  
        WHEN p.contype = 'u' THEN 't'  
        ELSE 'f'
    END AS is_unique_key,
    CASE
        WHEN p.contype = 'u' THEN p.conname
    END AS unique_key_name,
    CASE
        WHEN p.contype = 'f' THEN 't'
        ELSE 'f'
    END AS is_foreign_key,
    CASE
        WHEN p.contype = 'f' THEN p.conname
    END AS foreignkey_name,
    CASE
        WHEN p.contype = 'f' THEN p.confkey
    END AS foreign_key_columnid,
    CASE
        WHEN p.contype = 'f' THEN g.relname
    END AS foreign_key_table,
    CASE
        WHEN p.contype = 'f' THEN p.conkey
    END AS foreign_key_local_column_id,
    CASE
        WHEN f.atthasdef = 't' THEN d.adsrc
    END AS default_value
FROM pg_attribute f  
    JOIN pg_class c ON c.oid = f.attrelid  
    JOIN pg_type t ON t.oid = f.atttypid  
    LEFT JOIN pg_attrdef d ON d.adrelid = c.oid AND d.adnum = f.attnum  
    LEFT JOIN pg_namespace n ON n.oid = c.relnamespace  
    LEFT JOIN pg_constraint p ON p.conrelid = c.oid AND f.attnum = ANY (p.conkey)  
    LEFT JOIN pg_class AS g ON p.confrelid = g.oid  
WHERE c.relkind = 'r'::char  
    AND f.attisdropped = false
    AND n.nspname = '%s'  -- Replace with Schema name  
    AND c.relname = '%s'  -- Replace with table name  
    AND f.attnum > 0 
ORDER BY f.attnum
;
作者: Howard Elton 发布者: 02.10.2018 06:56

10

143 作者的声誉

这应该是解决方案:

SELECT * FROM information_schema.columns
WHERE table_schema = 'your_schema'
   AND table_name   = 'your_table'
作者: LeYAUable 发布者: 09.01.2019 10:25
32x32