Elite QandA


How do you know if two tables are similar?


  1. How do you know if two tables are similar?
  2. How do I compare two tables in Bigquery?
  3. How can you tell if two tables have the same data in Hive?
  4. How do you use minus in BigQuery?
  5. How do I run the same query on multiple tables?
  6. How do I get matched and unmatched records from two tables in hive?
  7. Does except work in hive?
  8. How do I make a query in two tables?
  9. How would you identify the many side of a relationship between two tables in a database?
  10. What does Unnest do in BigQuery?
  11. How do you display not matching records from two tables?
  12. How would you return data from 2 tables even if there are no matches?
  13. How do you use MINUS in HQL?
  14. Does Union all remove duplicates in hive?

How do you know if two tables are similar?

Step 1 - Test for Duplicate Rows on TABLEA. If SELECT DISTINCT * FROM TABLEA. Step 2 - Test for Duplicate Rows on TABLEB. If SELECT DISTINCT * FROM TABLEB. Step 3 - INNER JOIN TABLEA to TABLEB on every column.Dec 14, 2012

How do I compare two tables in Bigquery?

This will contain the base table for comparison.CREATE OR REPLACE TABLE `transactions.left_table` AS. SELECT. r AS id, CAST(r AS STRING) AS col1, CREATE OR REPLACE TABLE `transactions.right_table` AS. WITH. DataChanges AS ( SELECT. WITH. LeftData AS ( SELECT. SELECT. CASE. WHEN a.id IS NULL AND b.id IS NOT NULL THEN "I"Sep 30, 2019

How can you tell if two tables have the same data in Hive?

If you want to check for duplicates and the tables have exactly the same structure and the tables do not have duplicates within them, then you can do: select t. key, t. c1, t.

How do you use minus in BigQuery?

Though there is no MINUS function in BigQuery, you can use a LEFT OUTER JOIN as an alternative.

How do I run the same query on multiple tables?

Run SELECT table_name FROM information_schema. Open a new spreadsheet and copy the table list into column "A" of the sheet starting at row 1.Select cell B1 and fill the string formula down to match the number of table names.You should not have a list of queries for every table.

How do I get matched and unmatched records from two tables in hive?

first union DISTINCT row and make finalTable . it has all unique row. then make inner join between two table. final subtract them ,now you got your answer.

Does except work in hive?

In SQL, MINUS is also called EXCEPT. The MINUS operator finds the difference between two tables or sub-queries and return results from only first SELECT statement.

How do I make a query in two tables?

Build a select query by using tables with a many-to-many relationshipOn the Create tab, in the Queries group, click Query Design.Double-click the two tables that contain the data you want to include in your query and also the junction table that links them, and then click Close.

How would you identify the many side of a relationship between two tables in a database?

The symbol that indicates the "many" side of a one-to-many relationship. In a one-to-many relationship between two tables, the foreign key field is the field in the "many" table that links the table to the primary key field in the "one" table.

What does Unnest do in BigQuery?

To convert an ARRAY into a set of rows, also known as "flattening," use the UNNEST operator. UNNEST takes an ARRAY and returns a table with a single row for each element in the ARRAY . Because UNNEST destroys the order of the ARRAY elements, you may wish to restore order to the table.

How do you display not matching records from two tables?

SELECT B. Accountid FROM TableB AS B LEFT JOIN TableA AS A ON A.ID = B. Accountid WHERE A.ID IS NULL, LEFT JOIN means it takes all the rows from the first table - if there are no matches on the first join condition, the result table columns for table B will be null - that's why it works.

How would you return data from 2 tables even if there are no matches?

LEFT JOIN is used, this will return ALL rows from Table1 , regardless of whether or not there is a matching row in Table2 .

How do you use MINUS in HQL?

2 Answers. MINUS function not exists in HQL, go here on paragraph 14.10 Expressions. Does HQL allow the usage of the EXCEPT operator? To be strictly equivalent to the MINUS query, you would need to add a DISTINCT - however, if A.id is unique then it doesn't matter.

Does Union all remove duplicates in hive?

0 only support UNION ALL (bag union), in which duplicate rows are not eliminated. In Hive 1.2. 0 and later, the default behavior for UNION is that duplicate rows are removed from the result.



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What is an example of a constraints?

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What are the technical constraints in network?

Similar to business constraints, technical constraints represent any of a number of technical issues and obstacles that will impact the network design. For example, a company may have made a fairly recent investment in some new equipment, and require that this equipment be incorporated into the new network design.




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