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The SHOW TABLES command returns a list of views created within a schema. Italso returns the tables that exist in Hive and HBase when you use storage plugin configurations for these data sources. See Storage PluginRegistration.
Syntax
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The SHOW TABLES command supports the following syntax:
Usage Notes
First issue the USE command to identify the schema for which you want to viewtables or views. For example, the following USE statement tells Drill that youonly want information from the dfs.myviews schema:
In this example, “myviews” is a workspace created within thedfs storage plugin configuration.
When you use a particular schema and then issue the SHOW TABLES command, Drillreturns the tables and views within that schema.
Limitations
You can create and query tables within the file system, however Drill does not return these tables when you issue the SHOW TABLES command. You can issue the SHOW FILES command to see a list of all files, tables, and views, including those created in Drill.
You cannot create Hive or HBase tables in Drill.
Examples
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The following examples demonstrate the steps that you can follow when you wantto issue the SHOW TABLES command on the file system, Hive, and HBase.
Complete the following steps to see views that exist in a file system andtables that exist in Hive and HBase data sources:
Issue the SHOW SCHEMAS command to see a list of available schemas.
0: jdbc:drill:zk=drilldemo:5181> show schemas; ——————– SCHEMA_NAME ——————– hive.default dfs.reviews dfs.flatten dfs.default dfs.root dfs.logs dfs.myviews dfs.clicks dfs.tmp sys hbase INFORMATION_SCHEMA s3.twitter s3.reviews s3.default ——————– 15 rows selected (0.072 seconds)
Issue the USE command to switch to a particular schema. When you use a particular schema, Drill searches or queries within that schema only.
0: jdbc:drill:zk=drilldemo:5181> use dfs.myviews; —— —————————————– ok summary —— —————————————– true Default schema changed to ‘dfs.myviews’ —— —————————————– 1 row selected (0.025 seconds)
Issue the SHOW TABLES command to see the views or tables that exist within workspace.
0: jdbc:drill:zk=drilldemo:5181> show tables; ————– —————– TABLE_SCHEMA TABLE_NAME ————– —————– dfs.myviews logs_vw dfs.myviews customers_vw dfs.myviews s3_review_vw dfs.myviews clicks_vw dfs.myviews nestedclickview dfs.myviews s3_user_vw dfs.myviews s3_bus_vw ————– —————– 7 rows selected (0.499 seconds) 0: jdbc:drill:zk=drilldemo:5181>
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Switch to the Hive schema and issue the SHOW TABLES command to see the Hive tables that exist.
0: jdbc:drill:zk=drilldemo:5181> use hive; —— ———————————- ok summary —— ———————————- true Default schema changed to ‘hive’ —— ———————————- 1 row selected (0.043 seconds)
0: jdbc:drill:zk=drilldemo:5181> show tables; ————– ———— TABLE_SCHEMA TABLE_NAME ————– ———— hive.default orders hive.default products ————– ———— 2 rows selected (0.552 seconds)
Switch to the HBase schema and issue the SHOW TABLES command to see the HBase tables that exist within the schema.
0: jdbc:drill:zk=drilldemo:5181> use hbase; —— ———————————– ok summary —— ———————————– true Default schema changed to ‘hbase’ —— ———————————– 1 row selected (0.043 seconds)
0: jdbc:drill:zk=drilldemo:5181> show tables; ————– ———— TABLE_SCHEMA TABLE_NAME ————– ———— hbase customers ————– ———— 1 row selected (0.412 seconds)
