How to filter data with spark read?

How to filter data with spark read?

Spark filter() or where() function is used to filter the rows from DataFrame or Dataset based on the given one or multiple conditions or SQL expression. You can use where() operator instead of the filter if you are coming from SQL background. Both these functions operate exactly the same.

How do you sort datasets in PySpark?

PySpark DataFrame class provides sort() function to sort on one or more columns. By default, it sorts by ascending order. The above two examples return the same below output, the first one takes the DataFrame column name as a string and the next takes columns in Column type.

How do I filter distinct values in PySpark DataFrame?

Use pyspark distinct() to select unique rows from all columns. It returns a new DataFrame after selecting only distinct column values, when it finds any rows having unique values on all columns it will be eliminated from the results.

How do I filter rows in spark DataFrame?

In Apache Spark, the where() function can be used to filter rows in a DataFrame based on a given condition. The condition is specified as a string that is evaluated for each row in the DataFrame. Rows for which the condition evaluates to True are retained, while those for which it evaluates to False are removed.

How do I filter my data?

Select data filter select the arrow. Select text filters or number filters. Choose a comparison like between enter the filter criteria.

How do you filter data with filters?

Filter a range of data

  1. Select any cell within the range.
  2. Select Data > Filter.
  3. Select the column header arrow .
  4. Select Text Filters or Number Filters, and then select a comparison, like Between.
  5. Enter the filter criteria and select OK.

How do I sort a Dataset in Spark?

Spark DataFrame/Dataset class provides sort() function to sort on one or more columns. By default, it sorts by ascending order. The above two examples return the same below output, the first one takes the DataFrame column name as a string and the next takes columns in Column type.

How do you sort data in a Dataset?

You can sort a DataFrame by row or column value as well as by row or column index. Both rows and columns have indices, which are numerical representations of where the data is in your DataFrame. You can retrieve data from specific rows or columns using the DataFrame's index locations.

What does distinct () do in PySpark?

In PySpark, the distinct() function is widely used to drop or remove the duplicate rows or all columns from the DataFrame.

How do you select unique data from DataFrame?

How to Get Unique Values in DataFrame Column?

  1. 1) Using unique() method.
  2. 2) Using the drop_duplicates method.
  3. 3) Get unique values in multiple columns.
  4. 4) Count unique values in a single column.
  5. 5) Count unique values in each columns.

How do you use filter and select in PySpark?

In PySpark, to filter() rows on DataFrame based on multiple conditions, you case use either Column with a condition or SQL expression. Below is just a simple example using AND (&) condition, you can extend this with OR(|), and NOT(!) conditional expressions as needed. This yields below DataFrame results.

How do I filter row data?

▸ Click within the data range, and then in the Ribbon, go to Home > Editing > Filter. Small drop-down arrows (filter buttons) are applied to the header row of your data. Click on one of the arrows to start filtering your data. Tip: The shortcut to apply an AutoFilter is CTRL + SHIFT + L.

Which command is used to filter data?

Filter a range of data

Select any cell within the range. Select Data > Filter. Select Text Filters or Number Filters, and then select a comparison, like Between. Enter the filter criteria and select OK.

Why can’t I filter my data?

If the worksheet has blank rows the filter function will not work smoothly because filters don't consider the cells with the first blank spaces. To solve this issue, you have to choose the cell range before using the filter function.

How do you filter a dataset?

Filter a range of data

  1. Select any cell within the range.
  2. Select Data > Filter.
  3. Select the column header arrow .
  4. Select Text Filters or Number Filters, and then select a comparison, like Between.
  5. Enter the filter criteria and select OK.

How do you select filter data?

Remove all the filters in a worksheet

If you want to completely remove filters, go to the Data tab and click the Filter button, or use the keyboard shortcut Alt+D+F+F.

How do you sort a Dataset table?

Sort data in a table

  1. Select a cell within the data.
  2. Select Home > Sort & Filter. Or, select Data > Sort.
  3. Select an option: Sort A to Z – sorts the selected column in an ascending order. Sort Z to A – sorts the selected column in a descending order.

How do I sort a Dataset in spark?

Spark DataFrame/Dataset class provides sort() function to sort on one or more columns. By default, it sorts by ascending order. The above two examples return the same below output, the first one takes the DataFrame column name as a string and the next takes columns in Column type.