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Documentation
Describe
In order to view the schema of the result of a query, prepend DESCRIBE to a query.
DESCRIBE SELECT * FROM tbl;
In order to view the schema of a table, use DESCRIBE followed by the table name.
DESCRIBE tbl;
Below is an example of DESCRIBE on the lineitem table of TPC-H.
┌─────────────────┬───────────────┬──────┬──────┬─────────┬───────┐
│ column_name │ column_type │ null │ key │ default │ extra │
├─────────────────┼───────────────┼──────┼──────┼─────────┼───────┤
│ l_orderkey │ INTEGER │ NO │ NULL │ NULL │ NULL │
│ l_partkey │ INTEGER │ NO │ NULL │ NULL │ NULL │
│ l_suppkey │ INTEGER │ NO │ NULL │ NULL │ NULL │
│ l_linenumber │ INTEGER │ NO │ NULL │ NULL │ NULL │
│ l_quantity │ INTEGER │ NO │ NULL │ NULL │ NULL │
│ l_extendedprice │ DECIMAL(15,2) │ NO │ NULL │ NULL │ NULL │
│ l_discount │ DECIMAL(15,2) │ NO │ NULL │ NULL │ NULL │
│ l_tax │ DECIMAL(15,2) │ NO │ NULL │ NULL │ NULL │
│ l_returnflag │ VARCHAR │ NO │ NULL │ NULL │ NULL │
│ l_linestatus │ VARCHAR │ NO │ NULL │ NULL │ NULL │
│ l_shipdate │ DATE │ NO │ NULL │ NULL │ NULL │
│ l_commitdate │ DATE │ NO │ NULL │ NULL │ NULL │
│ l_receiptdate │ DATE │ NO │ NULL │ NULL │ NULL │
│ l_shipinstruct │ VARCHAR │ NO │ NULL │ NULL │ NULL │
│ l_shipmode │ VARCHAR │ NO │ NULL │ NULL │ NULL │
│ l_comment │ VARCHAR │ NO │ NULL │ NULL │ NULL │
└─────────────────┴───────────────┴──────┴──────┴─────────┴───────┘