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Add records that meet the criteria before each group after grouping ：From SQL to SPL

Multi combination condition grouping and aggregation #eg93

Split a Huge CSV File into Multiple Smaller CSV Files #eg69

Group & Summarize a CSV File #eg68

Getting positions of members according to primary key values #eg58

Getting members according to primary key values #eg63

How to Access Databases using One SQL Statement #eg71

Filter a CSV file and re-arrange it by category #eg60

Getting positions of members based on a specified condition #eg46

Convert Each Whites-space-separated Text Block into a Row #eg62

Perform Distinct on Ordered Numbers in a Text File #eg61

Parse a csv file having a primary-sub tables structure #eg41

Convert CSV Data into Multilevel JSON #eg56

Add a compute column to a csv file #eg40

SQL, in each group modify the null value of a specified column as its neighboring value #eg43

Get the whole group where at least one member meets the specified condition #eg36

Parse a csv file where field values are enclosed by quotation marks and contain carriage return #eg35

Replace Duplicate Digits in Every 9-digit Number in a Text File with Non-duplicate Ones #eg52

Reverse Rows in a Text File #eg51

The Difference between Each Value in a Certain Column and Its Previous One and Display Result

Java, perform COUNT on each group of a large csv file #eg33

SQL, extract unique values of JSON format field from each group #eg42

Multi-condition filtering #eg48

Getting members based on a specified condition #47

Read specified columns from a csv file #eg44

Something could double the development efficiency of Java programmers

Java, fill each row having a null value in a csv file with values in the directly previous row #eg32

To Index Data is To Sort Data

Clear duplicate lines and lines having missing values from a csv file #eg24

SQL, Set different flags for different groups according to whether there are duplicate values #eg19