Sage-Tips

How do I check if a row has duplicates?

Find and remove duplicates

1. Select the cells you want to check for duplicates.
2. Click Home > Conditional Formatting > Highlight Cells Rules > Duplicate Values.
3. In the box next to values with, pick the formatting you want to apply to the duplicate values, and then click OK.

How do I identify and delete duplicates in hive?

Remove Duplicate Records from Hive Table

1. Use Insert Overwrite and DISTINCT Keyword.
2. GROUP BY Clause to Remove Duplicate.
3. Use Insert Overwrite with row_number() analytics functions.

How can I retrieve duplicate rows?

To select duplicate values, you need to create groups of rows with the same values and then select the groups with counts greater than one. You can achieve that by using GROUP BY and a HAVING clause.

Does select return duplicate rows?

Select Distinct will remove duplicates if the rows are actually duplicated for all columns, but will not eliminate ‘duplicates’ that have a different value in any column.

How do I find duplicates in sheets?

Use Google Sheets’ Remove Duplicates Feature

1. Highlight the columns you want to check for duplicate data.
2. In the menu at the top, select Data, and then choose Remove duplicates.
3. A dialogue popup will appear.

How do I delete specific rows in Hive?

Use the following syntax to delete data from a Hive table. DELETE FROM tablename [WHERE expression]; Delete any rows of data from the students table if the gpa column has a value of 1 or 0.

What is Dedup in Hive?

Sometimes, we have a requirement to remove duplicate events from the hive table partition. There could be multiple ways to do it. Usually, it depends on the conditions based on which we want do it.

How do you find duplicates in a table?

Using GROUP BY clause to find duplicates in a table

1. First, the GROUP BY clause groups the rows into groups by values in both a and b columns.
2. Second, the COUNT() function returns the number of occurrences of each group (a,b).

How do I check if a column contains duplicates in SQL?

How to Find Duplicate Values in SQL

1. Using the GROUP BY clause to group all rows by the target column(s) – i.e. the column(s) you want to check for duplicate values on.
2. Using the COUNT function in the HAVING clause to check if any of the groups have more than 1 entry; those would be the duplicate values.

How do I find duplicates in a list?

Check for duplicates in a list using Set & by comparing sizes

1. Add the contents of list in a set. As set contains only unique elements, so no duplicates will be added to the set.
2. Compare the size of set and list. If size of list & set is equal then it means no duplicates in list.

How to remove duplicate values from a table in hive?

To remove duplicate values, you can use insert overwrite table in Hive using the DISTINCT keyword while selecting from the original table. The DISTINCT keyword returns unique records from the table.

What is the use of row_number function in hive?

The row_number Hive analytic function is used to rank or number the rows. Here we use the row_number function to rank the rows for each group of records and then select only record from that group. For example, consider below example to insert overwrite table using analytical functions to remove duplicate rows.

How to insert unique records into a table in hive?

You can use INSERT OVERWRITE to insert unique records into table. The row_number Hive analytic function is used to rank or number the rows. Here we use the row_number function to rank the rows for each group of records and then select only record from that group.

What is an example of an external hive table?

Example: Lets consider i have 5 columns in the table. This is an EXTERNAL HIVE TABLE partitioned by DAYID and MARKETID. Whenever the columns other than CREATEDATE (as referred by Row 1 and 2) are same OR if the rows are duplicate (as referred by Row 3 and 4) it should retain any one of those rows.