SHOW Statements

SHOW statements are used to list objects within their corresponding parent, such as catalogs, databases, tables and views, columns, functions, and modules. See the individual commands for more details and additional options.

SHOW CREATE statements are used to print a DDL statement with which a given object can be created. The currently ‘SHOW CREATE’ statement is only available in printing DDL statement of the given table and view.

Flink SQL supports the following SHOW statements for now:

• SHOW CATALOGS
• SHOW CURRENT CATALOG
• SHOW DATABASES
• SHOW CURRENT DATABASE
• SHOW TABLES
• SHOW CREATE TABLE
• SHOW COLUMNS
• SHOW VIEWS
• SHOW CREATE VIEW
• SHOW FUNCTIONS
• SHOW MODULES
• SHOW JARS

Run a SHOW statement

Java

SHOW statements can be executed with the executeSql() method of the TableEnvironment. The executeSql() method returns objects for a successful SHOW operation, otherwise will throw an exception.

The following examples show how to run a SHOW statement in TableEnvironment.

Scala

SHOW statements can be executed with the executeSql() method of the TableEnvironment. The executeSql() method returns objects for a successful SHOW operation, otherwise will throw an exception.

The following examples show how to run a SHOW statement in TableEnvironment.

Python

SHOW statements can be executed with the execute_sql() method of the TableEnvironment. The execute_sql() method returns objects for a successful SHOW operation, otherwise will throw an exception.

The following examples show how to run a SHOW statement in TableEnvironment.

SQL CLI

SHOW statements can be executed in SQL CLI.

The following examples show how to run a SHOW statement in SQL CLI.

Java

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);
// show catalogs
tEnv.executeSql("SHOW CATALOGS").print();
// +-----------------+
// |    catalog name |
// +-----------------+
// | default_catalog |
// +-----------------+
// show current catalog
tEnv.executeSql("SHOW CURRENT CATALOG").print();
// +----------------------+
// | current catalog name |
// +----------------------+
// |      default_catalog |
// +----------------------+
// show databases
tEnv.executeSql("SHOW DATABASES").print();
// +------------------+
// |    database name |
// +------------------+
// | default_database |
// +------------------+
// show current database
tEnv.executeSql("SHOW CURRENT DATABASE").print();
// +-----------------------+
// | current database name |
// +-----------------------+
// |      default_database |
// +-----------------------+
// create a table
tEnv.executeSql("CREATE TABLE my_table (...) WITH (...)");
// show tables
tEnv.executeSql("SHOW TABLES").print();
// +------------+
// | table name |
// +------------+
// |   my_table |
// +------------+
// show create table
tEnv.executeSql("SHOW CREATE TABLE my_table").print();
// CREATE TABLE `default_catalog`.`default_db`.`my_table` (
//   ...
// ) WITH (
//   ...
// )
// show columns
tEnv.executeSql("SHOW COLUMNS FROM my_table LIKE '%f%'").print();
// +--------+-------+------+-----+--------+-----------+
// |   name |  type | null | key | extras | watermark |
// +--------+-------+------+-----+--------+-----------+
// | field2 | BYTES | true |     |        |           |
// +--------+-------+------+-----+--------+-----------+
// create a view
tEnv.executeSql("CREATE VIEW my_view AS SELECT * FROM my_table");
// show views
tEnv.executeSql("SHOW VIEWS").print();
// +-----------+
// | view name |
// +-----------+
// |   my_view |
// +-----------+
// show create view
tEnv.executeSql("SHOW CREATE VIEW my_view").print();
// CREATE VIEW `default_catalog`.`default_db`.`my_view`(`field1`, `field2`, ...) as
// SELECT *
// FROM `default_catalog`.`default_database`.`my_table`
// show functions
tEnv.executeSql("SHOW FUNCTIONS").print();
// +---------------+
// | function name |
// +---------------+
// |           mod |
// |        sha256 |
// |           ... |
// +---------------+
// create a user defined function
tEnv.executeSql("CREATE FUNCTION f1 AS ...");
// show user defined functions
tEnv.executeSql("SHOW USER FUNCTIONS").print();
// +---------------+
// | function name |
// +---------------+
// |            f1 |
// |           ... |
// +---------------+
// show modules
tEnv.executeSql("SHOW MODULES").print();
// +-------------+
// | module name |
// +-------------+
// |        core |
// +-------------+
// show full modules
tEnv.executeSql("SHOW FULL MODULES").print();
// +-------------+-------+
// | module name |  used |
// +-------------+-------+
// |        core |  true |
// |        hive | false |
// +-------------+-------+

Scala

val env = StreamExecutionEnvironment.getExecutionEnvironment()
val tEnv = StreamTableEnvironment.create(env)
// show catalogs
tEnv.executeSql("SHOW CATALOGS").print()
// +-----------------+
// |    catalog name |
// +-----------------+
// | default_catalog |
// +-----------------+
// show databases
tEnv.executeSql("SHOW DATABASES").print()
// +------------------+
// |    database name |
// +------------------+
// | default_database |
// +------------------+
// create a table
tEnv.executeSql("CREATE TABLE my_table (...) WITH (...)")
// show tables
tEnv.executeSql("SHOW TABLES").print()
// +------------+
// | table name |
// +------------+
// |   my_table |
// +------------+
// show create table
tEnv.executeSql("SHOW CREATE TABLE my_table").print()
// CREATE TABLE `default_catalog`.`default_db`.`my_table` (
//  ...
// ) WITH (
//  ...
// )
// show columns
tEnv.executeSql("SHOW COLUMNS FROM my_table LIKE '%f%'").print()
// +--------+-------+------+-----+--------+-----------+
// |   name |  type | null | key | extras | watermark |
// +--------+-------+------+-----+--------+-----------+
// | field2 | BYTES | true |     |        |           |
// +--------+-------+------+-----+--------+-----------+
// create a view
tEnv.executeSql("CREATE VIEW my_view AS SELECT * FROM my_table")
// show views
tEnv.executeSql("SHOW VIEWS").print()
// +-----------+
// | view name |
// +-----------+
// |   my_view |
// +-----------+
// show create view
tEnv.executeSql("SHOW CREATE VIEW my_view").print();
// CREATE VIEW `default_catalog`.`default_db`.`my_view`(`field1`, `field2`, ...) as
// SELECT *
// FROM `default_catalog`.`default_database`.`my_table`
// show functions
tEnv.executeSql("SHOW FUNCTIONS").print()
// +---------------+
// | function name |
// +---------------+
// |           mod |
// |        sha256 |
// |           ... |
// +---------------+
// create a user defined function
tEnv.executeSql("CREATE FUNCTION f1 AS ...")
// show user defined functions
tEnv.executeSql("SHOW USER FUNCTIONS").print()
// +---------------+
// | function name |
// +---------------+
// |            f1 |
// |           ... |
// +---------------+
// show modules
tEnv.executeSql("SHOW MODULES").print()
// +-------------+
// | module name |
// +-------------+
// |        core |
// +-------------+
// show full modules
tEnv.executeSql("SHOW FULL MODULES").print()
// +-------------+-------+
// | module name |  used |
// +-------------+-------+
// |        core |  true |
// |        hive | false |
// +-------------+-------+

Python

table_env = StreamTableEnvironment.create(...)
# show catalogs
table_env.execute_sql("SHOW CATALOGS").print()
# +-----------------+
# |    catalog name |
# +-----------------+
# | default_catalog |
# +-----------------+
# show databases
table_env.execute_sql("SHOW DATABASES").print()
# +------------------+
# |    database name |
# +------------------+
# | default_database |
# +------------------+
# create a table
table_env.execute_sql("CREATE TABLE my_table (...) WITH (...)")
# show tables
table_env.execute_sql("SHOW TABLES").print()
# +------------+
# | table name |
# +------------+
# |   my_table |
# +------------+
# show create table
table_env.executeSql("SHOW CREATE TABLE my_table").print()
# CREATE TABLE `default_catalog`.`default_db`.`my_table` (
#   ...
# ) WITH (
#   ...
# )
# show columns
table_env.execute_sql("SHOW COLUMNS FROM my_table LIKE '%f%'").print()
# +--------+-------+------+-----+--------+-----------+
# |   name |  type | null | key | extras | watermark |
# +--------+-------+------+-----+--------+-----------+
# | field2 | BYTES | true |     |        |           |
# +--------+-------+------+-----+--------+-----------+
# create a view
table_env.execute_sql("CREATE VIEW my_view AS SELECT * FROM my_table")
# show views
table_env.execute_sql("SHOW VIEWS").print()
# +-----------+
# | view name |
# +-----------+
# |   my_view |
# +-----------+
# show create view
table_env.execute_sql("SHOW CREATE VIEW my_view").print()
# CREATE VIEW `default_catalog`.`default_db`.`my_view`(`field1`, `field2`, ...) as
# SELECT *
# FROM `default_catalog`.`default_database`.`my_table`
# show functions
table_env.execute_sql("SHOW FUNCTIONS").print()
# +---------------+
# | function name |
# +---------------+
# |           mod |
# |        sha256 |
# |           ... |
# +---------------+
# create a user defined function
table_env.execute_sql("CREATE FUNCTION f1 AS ...")
# show user defined functions
table_env.execute_sql("SHOW USER FUNCTIONS").print()
# +---------------+
# | function name |
# +---------------+
# |            f1 |
# |           ... |
# +---------------+
# show modules
table_env.execute_sql("SHOW MODULES").print()
# +-------------+
# | module name |
# +-------------+
# |        core |
# +-------------+
# show full modules
table_env.execute_sql("SHOW FULL MODULES").print()
# +-------------+-------+
# | module name |  used |
# +-------------+-------+
# |        core |  true |
# |        hive | false |
# +-------------+-------+

SQL CLI

Flink SQL> SHOW CATALOGS;
default_catalog
Flink SQL> SHOW DATABASES;
default_database
Flink SQL> CREATE TABLE my_table (...) WITH (...);
[INFO] Table has been created.
Flink SQL> SHOW TABLES;
my_table
Flink SQL> SHOW CREATE TABLE my_table;
CREATE TABLE `default_catalog`.`default_db`.`my_table` (
  ...
) WITH (
  ...
)
Flink SQL> SHOW COLUMNS from MyUserTable LIKE '%f%';
+--------+-------+------+-----+--------+-----------+
|   name |  type | null | key | extras | watermark |
+--------+-------+------+-----+--------+-----------+
| field2 | BYTES | true |     |        |           |
+--------+-------+------+-----+--------+-----------+
1 row in set
Flink SQL> CREATE VIEW my_view AS SELECT * from my_table;
[INFO] View has been created.
Flink SQL> SHOW VIEWS;
my_view
Flink SQL> SHOW CREATE VIEW my_view;
CREATE VIEW `default_catalog`.`default_db`.`my_view`(`field1`, `field2`, ...) as
SELECT *
FROM `default_catalog`.`default_database`.`my_table`
Flink SQL> SHOW FUNCTIONS;
mod
sha256
...
Flink SQL> CREATE FUNCTION f1 AS ...;
[INFO] Function has been created.
Flink SQL> SHOW USER FUNCTIONS;
f1
...
Flink SQL> SHOW MODULES;
+-------------+
| module name |
+-------------+
|        core |
+-------------+
1 row in set
Flink SQL> SHOW FULL MODULES;
+-------------+------+
| module name | used |
+-------------+------+
|        core | true |
+-------------+------+
1 row in set
Flink SQL> SHOW JARS;
/path/to/addedJar.jar

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SHOW CATALOGS

SHOW CATALOGS

Show all catalogs.

SHOW CURRENT CATALOG

SHOW CURRENT CATALOG

Show current catalog.

SHOW DATABASES

SHOW DATABASES

Show all databases in the current catalog.

SHOW CURRENT DATABASE

SHOW CURRENT DATABASE

Show current database.

SHOW TABLES

SHOW TABLES [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] LIKE <sql_like_pattern> ]

Show all tables for an optionally specified database. If no database is specified then the tables are returned from the current database. Additionally, the output of this statement may be filtered by an optional matching pattern.

LIKE Show all tables with given table name and optional LIKE clause, whose name is whether similar to the <sql_like_pattern>.

The syntax of sql pattern in LIKE clause is the same as that of MySQL dialect.

• % matches any number of characters, even zero characters, \% matches one % character.
• _ matches exactly one character, \_ matches one _ character.

SHOW TABLES EXAMPLES

Assumes that the db1 database located in catalog1 catalog has the following tables:

• person
• dim

the current database in session has the following tables:

• fights

• orders

• Shows all tables of the given database.

show tables from db1;
-- show tables from catalog1.db1;
-- show tables in db1;
-- show tables in catalog1.db1;
+------------+
| table name |
+------------+
|        dim |
|     person |
+------------+
2 rows in set

• Shows all tables of the given database, which are similar to the given sql pattern.

show tables from db1 like '%n';
-- show tables from catalog1.db1 like '%n';
-- show tables in db1 like '%n';
-- show tables in catalog1.db1 like '%n';
+------------+
| table name |
+------------+
|     person |
+------------+
1 row in set

• Shows all tables of the given database, which are not similar to the given sql pattern.

show tables from db1 not like '%n';
-- show tables from catalog1.db1 not like '%n';
-- show tables in db1 not like '%n';
-- show tables in catalog1.db1 not like '%n';
+------------+
| table name |
+------------+
|        dim |
+------------+
1 row in set

• Shows all tables of the current database.

show tables;
+------------+
| table name |
+------------+
|      items |
|     orders |
+------------+
2 rows in set

SHOW CREATE TABLE

SHOW CREATE TABLE

Show create table statement for specified table.

Attention Currently SHOW CREATE TABLE only supports table that is created by Flink SQL DDL.

SHOW COLUMNS

SHOW COLUMNS ( FROM | IN ) [[catalog_name.]database.]<table_name> [ [NOT] LIKE <sql_like_pattern>]

Show all columns of the table with given table name and optional like clause.

LIKE Show all columns of the table with given table name and optional LIKE clause, whose name is whether similar to the <sql_like_pattern>.

The syntax of sql pattern in LIKE clause is the same as that of MySQL dialect.

SHOW COLUMNS EXAMPLES

Assumes that the table named orders in the database1 database which is located in the catalog1 catalog has the following structure:

+---------+-----------------------------+-------+-----------+---------------+----------------------------+
|    name |                        type |  null |       key |        extras |                  watermark |
+---------+-----------------------------+-------+-----------+---------------+----------------------------+
|    user |                      BIGINT | false | PRI(user) |               |                            |
| product |                 VARCHAR(32) |  true |           |               |                            |
|  amount |                         INT |  true |           |               |                            |
|      ts |      TIMESTAMP(3) *ROWTIME* |  true |           |               | `ts` - INTERVAL '1' SECOND |
|   ptime | TIMESTAMP_LTZ(3) *PROCTIME* | false |           | AS PROCTIME() |                            |
+---------+-----------------------------+-------+-----------+---------------+----------------------------+

• Shows all columns of the given table.

show columns from orders;
-- show columns from database1.orders;
-- show columns from catalog1.database1.orders;
-- show columns in orders;
-- show columns in database1.orders;
-- show columns in catalog1.database1.orders;
+---------+-----------------------------+-------+-----------+---------------+----------------------------+
|    name |                        type |  null |       key |        extras |                  watermark |
+---------+-----------------------------+-------+-----------+---------------+----------------------------+
|    user |                      BIGINT | false | PRI(user) |               |                            |
| product |                 VARCHAR(32) |  true |           |               |                            |
|  amount |                         INT |  true |           |               |                            |
|      ts |      TIMESTAMP(3) *ROWTIME* |  true |           |               | `ts` - INTERVAL '1' SECOND |
|   ptime | TIMESTAMP_LTZ(3) *PROCTIME* | false |           | AS PROCTIME() |                            |
+---------+-----------------------------+-------+-----------+---------------+----------------------------+
5 rows in set

• Shows all columns of the given table, which are similar to the given sql pattern.

show columns from orders like '%r';
-- show columns from database1.orders like '%r';
-- show columns from catalog1.database1.orders like '%r';
-- show columns in orders like '%r';
-- show columns in database1.orders like '%r';
-- show columns in catalog1.database1.orders like '%r';
+------+--------+-------+-----------+--------+-----------+
| name |   type |  null |       key | extras | watermark |
+------+--------+-------+-----------+--------+-----------+
| user | BIGINT | false | PRI(user) |        |           |
+------+--------+-------+-----------+--------+-----------+
1 row in set

• Shows all columns of the given table, which are not similar to the given sql pattern.

show columns from orders not like '%_r';
-- show columns from database1.orders not like '%_r';
-- show columns from catalog1.database1.orders not like '%_r';
-- show columns in orders not like '%_r';
-- show columns in database1.orders not like '%_r';
-- show columns in catalog1.database1.orders not like '%_r';
+---------+-----------------------------+-------+-----+---------------+----------------------------+
|    name |                        type |  null | key |        extras |                  watermark |
+---------+-----------------------------+-------+-----+---------------+----------------------------+
| product |                 VARCHAR(32) |  true |     |               |                            |
|  amount |                         INT |  true |     |               |                            |
|      ts |      TIMESTAMP(3) *ROWTIME* |  true |     |               | `ts` - INTERVAL '1' SECOND |
|   ptime | TIMESTAMP_LTZ(3) *PROCTIME* | false |     | AS PROCTIME() |                            |
+---------+-----------------------------+-------+-----+---------------+----------------------------+
4 rows in set

SHOW VIEWS

SHOW VIEWS

Show all views in the current catalog and the current database.

SHOW CREATE VIEW

SHOW CREATE VIEW [catalog_name.][db_name.]view_name

Show create view statement for specified view.

SHOW FUNCTIONS

SHOW [USER] FUNCTIONS

Show all functions including system functions and user-defined functions in the current catalog and current database.

USER Show only user-defined functions in the current catalog and current database.

SHOW MODULES

SHOW [FULL] MODULES

Show all enabled module names with resolution order.

FULL Show all loaded modules and enabled status with resolution order.

SHOW JARS

SHOW JARS

Show all added jars in the session classloader which are added by ADD JAR statements.

Attention Currently SHOW JARS only works in the SQL CLI.

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