How to list all tables
The SHOW TABLES command can be used to obtain a list of all tables:
SHOW TABLES;
To view the schema of an individual table, use the DESCRIBE command.
DESCRIBE nation;
The DESCRIBE command can also be used without a parameter to view all tables together with their columns and column types.
DESCRIBE;
Below is an example of DESCRIBE without any parameters on the TPC-H dataset.
┌────────────┬────────────────────────────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────────────────────────────┬───────────┐
│ table_name │ column_names │ column_types │ temporary │
├────────────┼────────────────────────────────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────────────┼───────────┤
│ customer │ [c_acctbal, c_address, c_comment, c_custkey, c_mktsegment, c_name, c_nationkey,... │ [DECIMAL(15,2), VARCHAR, VARCHAR, INTEGER, VARCHAR, VARCHAR, INTEGER, VARCHAR] │ false │
│ lineitem │ [l_comment, l_commitdate, l_discount, l_extendedprice, l_linenumber, l_linestat... │ [VARCHAR, DATE, DECIMAL(15,2), DECIMAL(15,2), INTEGER, VARCHAR, INTEGER, INTEGE... │ false │
│ nation │ [n_comment, n_name, n_nationkey, n_regionkey] │ [VARCHAR, VARCHAR, INTEGER, INTEGER] │ false │
│ orders │ [o_clerk, o_comment, o_custkey, o_orderdate, o_orderkey, o_orderpriority, o_ord... │ [VARCHAR, VARCHAR, INTEGER, DATE, INTEGER, VARCHAR, VARCHAR, INTEGER, DECIMAL(1... │ false │
│ part │ [p_brand, p_comment, p_container, p_mfgr, p_name, p_partkey, p_retailprice, p_s... │ [VARCHAR, VARCHAR, VARCHAR, VARCHAR, VARCHAR, INTEGER, DECIMAL(15,2), INTEGER, ... │ false │
│ partsupp │ [ps_availqty, ps_comment, ps_partkey, ps_suppkey, ps_supplycost] │ [INTEGER, VARCHAR, INTEGER, INTEGER, DECIMAL(15,2)] │ false │
│ region │ [r_comment, r_name, r_regionkey] │ [VARCHAR, VARCHAR, INTEGER] │ false │
│ supplier │ [s_acctbal, s_address, s_comment, s_name, s_nationkey, s_phone, s_suppkey] │ [DECIMAL(15,2), VARCHAR, VARCHAR, VARCHAR, INTEGER, VARCHAR, INTEGER] │ false │
└────────────┴────────────────────────────────────────────────────────────────────────────────────┴────────────────────────────────────────────────────────────────────────────────────┴───────────┘
The SQL-standard information_schema views are also defined.
DuckDB also defines sqlite_master, and many Postgres system catalog tables for compatibility with SQLite and Postgres respectively.