Avec la requête suivante, nous pouvons obtenir une liste des noms de colonnes et le type de données d'une table dans PostgreSQL.
SELECT
a.attname as "Column",
pg_catalog.format_type(a.atttypid, a.atttypmod) as "Datatype"
FROM
pg_catalog.pg_attribute a
WHERE
a.attnum > 0
AND NOT a.attisdropped
AND a.attrelid = (
SELECT c.oid
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relname ~ '^(hello world)$'
AND pg_catalog.pg_table_is_visible(c.oid)
);
Plus d'informations à ce sujet: http://www.postgresql.org/docs/9.3/static/catalog-pg-attribute.html
Ouvrez la ligne de commande psql et tapez:
\d+ table_name
select column_name,data_type
from information_schema.columns
where table_name = 'table_name';
avec la requête ci-dessus, vous pouvez colonnes et son type de données
Réponse Pratik mise à jour pour supporter plus de schémas et de valeurs nullables:
SELECT
"pg_attribute".attname as "Column",
pg_catalog.format_type("pg_attribute".atttypid, "pg_attribute".atttypmod) as "Datatype",
not("pg_attribute".attnotnull) AS "Nullable"
FROM
pg_catalog.pg_attribute "pg_attribute"
WHERE
"pg_attribute".attnum > 0
AND NOT "pg_attribute".attisdropped
AND "pg_attribute".attrelid = (
SELECT "pg_class".oid
FROM pg_catalog.pg_class "pg_class"
LEFT JOIN pg_catalog.pg_namespace "pg_namespace" ON "pg_namespace".oid = "pg_class".relnamespace
WHERE
"pg_namespace".nspname = 'schema'
AND "pg_class".relname = 'table'
);
N'oubliez pas d'ajouter le nom du schéma si vous avez plusieurs schémas portant le même nom de table.
SELECT column_name, data_type
FROM information_schema.columns
WHERE table_name = 'your_table_name' and table_schema = 'your_schema_name';
ou en utilisant psql:
\d+ your_schema_name.your_table_name
Pour obtenir des informations sur la colonne de la table, vous pouvez utiliser:
\dt+ [tablename]
Pour obtenir des informations sur le type de données dans la table, vous pouvez utiliser:
\dT+ [datatype]
sélectionnez nom_colonne, type_données à partir de informations_schema.columns où nom_table = 'nom_table_table' et table_catalog = 'nom_votre_base_données' et table_schema = 'nom_votre_schéma';
SELECT DISTINCT
ROW_NUMBER () OVER (ORDER BY pgc.relname , a.attnum) as rowid ,
pgc.relname as table_name ,
a.attnum as attr,
a.attname as name,
format_type(a.atttypid, a.atttypmod) as typ,
a.attnotnull as notnull,
com.description as comment,
coalesce(i.indisprimary,false) as primary_key,
def.adsrc as default
FROM pg_attribute a
JOIN pg_class pgc ON pgc.oid = a.attrelid
LEFT JOIN pg_index i ON
(pgc.oid = i.indrelid AND i.indkey[0] = a.attnum)
LEFT JOIN pg_description com on
(pgc.oid = com.objoid AND a.attnum = com.objsubid)
LEFT JOIN pg_attrdef def ON
(a.attrelid = def.adrelid AND a.attnum = def.adnum)
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = pgc.relnamespace
WHERE 1=1
AND pgc.relkind IN ('r','')
AND n.nspname <> 'pg_catalog'
AND n.nspname <> 'information_schema'
AND n.nspname !~ '^pg_toast'
AND a.attnum > 0 AND pgc.oid = a.attrelid
AND pg_table_is_visible(pgc.oid)
AND NOT a.attisdropped
ORDER BY rowid
;