Question

如何在PostgreSQL中使用psql命令执行等效的Oracle DESCRIBE TABLE？

Answer 1

试试这个（在psql命令行工具中）：

\d+ tablename

有关详细信息，请参阅the manual。

Answer 2

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

SQL标准方式，如here所示：

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。

Answer 3

如果要从查询而不是psql获取它，可以查询目录模式。这是一个复杂的查询：

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。

Answer 4

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

来源：faqs.org

Answer 5

与DESCRIBE TABLE等效的psql为\d table。

有关详细信息，请参阅PostgreSQL手册的psql部分。

Answer 6

您可以使用星号执行\d *search pattern * ，以查找与您感兴趣的搜索模式相匹配的表格。

Answer 7

除了您已找到的命令行\d+ <table_name>之外，您还可以使用information-schema使用info_schema.columns

来查找列数据

SELECT *
FROM info_schema.columns
WHERE table_schema = 'your_schema'
AND table_name   = 'your_table'

Answer 8

您可以使用：

SELECT attname 
FROM pg_attribute,pg_class 
WHERE attrelid=pg_class.oid 
AND relname='TableName' 
AND attstattarget <>0;

Answer 9

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，它会显示您要查找的特定coloumn的数据类型。

Answer 10

查询的这种变化（如其他答案中所述）对我有用。

if some_queryset.exists():
    print("There is at least one object in some_queryset")

这里详细描述： http://www.postgresqltutorial.com/postgresql-describe-table/

Answer 11

这应该是解决方案：

SELECT * FROM information_schema.columns
WHERE table_schema = 'your_schema'
   AND table_name   = 'your_table'

Answer 12

在 MySQL 中，DESCRIBE table_name

在 PostgreSQL ，\ d table_name

中

或者，你可以使用这个长命令：

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

Answer 13

为改进另一个答案的SQL查询（太好了！），这是一个经过修改的查询。它还包括约束名称，继承信息以及分解为组成部分的数据类型（类型，长度，精度，小数位数）。它还过滤掉已删除的列（数据库中仍然存在）。

$start = $_GET['start']; 
$per_page = 60;

//count recoreds
$data = $db->query("SELECT * FROM artists");
$record_count= $data->rowCount();

//count max pages
$max_pages = $record_count / $per_page;

//may come out as a decimal
if (!$start)
    $start = 0; 

$sth = $db->prepare("SELECT * FROM artists ORDER BY name LIMIT ?,?");
$sth->execute(array($start,$per_page));

foreach($sth as $info) { //return content }

Answer 14

您还可以使用以下查询

进行检查

Select * from schema_name.table_name limit 0;

示例：我的表有两列名称和密码。在下面给出截图。

*使用PG admin3

Answer 15

描述表格的最佳方式，例如列，类型，列的修饰符等。

\d+ tablename or \d tablename

Answer 16

有很多方法可以在PostgreSQL中描述表

简单的答案是

    > /d <table_name> -- OR

    > /d+ <table_name>

用法

如果您位于Postgres shell [psql]中，则需要描述表格

您也可以通过查询来实现这一目标[很多朋友已经发布了正确的方法]

Postgres的默认表名称information_schema中提供了有关该模式的许多详细信息。您可以使用简单的SQL语句直接使用它来检索任何表的信息。

简单查询

    SELECT
      *
    FROM
      information_schema.columns
    WHERE
      table_schema = 'your_schema' AND
      table_name   = 'your_table';

中等查询

  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

您只需要替换tablename。

硬查询

  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 = 'schema'  -- Replace with Schema name  
      AND c.relname = 'tablename'  -- Replace with table name  
      AND f.attnum > 0 ORDER BY number;

您可以选择上述任何一种方式来描述表格。

任何人都可以编辑这些答案以改进方法。我愿意合并您的更改。：）

Answer 17

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

Answer 18

1）使用psql的PostgreSQL DESCRIBE TABLE

在psql命令行工具中， \ d table_name 或 \ d + table_name 可以找到表列的信息

2）使用information_schema的PostgreSQL描述表

用于查询information_schema数据库中列表的column_names，数据类型，字符最大长度的SELECT语句；

选择 COLUMN_NAME，DATA_TYPE，CHARACTER_MAXIMUM_LENGTH 来自INFORMATION_SCHEMA.COLUMNS，其中table_name ='tablename';

有关更多信息，https://www.postgresqltutorial.com/postgresql-describe-table/

Answer 19

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                        |

Answer 20

当表不属于默认架构时，应输入：

\d+ schema_name.table_name

否则，您将收到错误消息，指出“该关系不存在。”

Answer 21

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

Answer 22

I worked out the following script for get table schema.

'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;

PostgreSQL“DESCRIBE TABLE”

22 个答案: