Hive - how do I get only count of tables from a database as output

user_10406448 0
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how do I get - only count of tables from a database as output - only count of columns from a table as output

hive
2 Answers

You can get this information from the metastore database:

hive=> SELECT "TBL_NAME", "COLUMN_NAME", "TYPE_NAME" FROM "TBLS" , "COLUMNS_V2" WHERE "TBL_ID"="CD_ID" UNION SELECT "TBL_NAME", "PKEY_NAME", "PKEY_TYPE" FROM "PARTITION_KEYS" p , "TBLS" t WHERE p."TBL_ID"=t."TBL_ID" ORDER BY "TBL_NAME";

  TBL_NAME  | COLUMN_NAME | TYPE_NAME 
------------+-------------+-----------
 tableA     | aaa         | string
 tableA     | bbb         | string
 tableB     | foo         | string
 tableB     | bar         | int
 tableC     | cola        | string
 tableD     | colb        | string
(6 rows)

Let me know if this helps.

user_58208140 
hive> select count(column_name) as NoOfColumns from information_schema.columns where table_name= "TableName";

hive> select count(table_name) as NoOfTables from information_schema.tables;

for more details: click here

user_60124510
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