Operation and maintenance notes --postgresql view the table structure, table names, field types, field Comment

Connect to the database server, switch to Postgres (or other user database), the

psql-- command line terminal into the database, perform the following operations related queries:

Display Database:

\l

Connect to the specified database:

\ C database name

View the current instance under the table:

\dt

By way sql statement query:

SELECT tablename FROM pg_tables;  

Lookup table structure and field information a particular table

\ D tablename-- actual table name

By way sql statement query:

SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar
    , a.attnotnull AS notnull, b.description AS comment
FROM pg_class c, pg_attribute a
    LEFT JOIN pg_description b
    ON a.attrelid = b.objoid
        AND a.attnum = b.objsubid, pg_type t
WHERE c.relname = '实际的表名'
    AND a.attnum > 0
    AND a.attrelid = c.oid
    AND a.atttypid = t.oid
ORDER BY a.attnum;