Articles by Tag #spl
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The impasse of SQL performance optimizing
Many big data calculations are implemented in SQL. When running slowly, we have to optimize SQL, but...
How to Transpose Columns in Each Group to a Single Row
We have a database table STAKEHOLDER as follows: We are trying to group the table by CLASS and...
How the performance improvement by orders of magnitude happened
We have worked out some performance optimization cases before, although there are not many, no one...
Is It Necessary to Use a Specialized In-Memory Database?
It is easy to think about using an in-memory database to solve the performance problem of reporting,...
SQL,Classify time-close events into a group and assign them a number #eg84
The table in the Big Query database records multiple events of a user, such as a user sorted by time...
Split a large csv file into smaller files #eg45
A csv file has a size far greater than 5M. Below is part of its data: Use Java to do this: Split...
Replace Duplicate Digits in Every 9-digit Number in a Text File with Non-duplicate Ones #eg52
Problem description & analysis Below is text file txt.txt: 853617639 975336865 The text file...
What else can Stream&Kotlin evolve into?
Java has not provided a direct dataset operation syntax for a long time, and writing a simple SUM...
Getting members according to primary key values #eg63
In the following product category table, ID field is the primary key. The task is to find ordinal...
Read specified columns from a csv file #eg44
Here is a standard format csv file: Use Java to do this: Use the specified multiple column numbers...
Do ordered grouping and aggregation within groups：SQL VS SPL #11
A certain database table describes the payment cycle for multiple projects (IDs), with one payment...
SQL: Recursive calculation of tree like hierarchical structure #eg83
SQL SERVER has a task table where the id field is the primary key and the parent field is the foreign...
The Difference between Each Value in a Certain Column and Its Previous One and Display Result
We have table SAMPLE in the Sybase database. The data is as follows: We are trying to calculate the...
Calculate the hierarchy of recursive references :From SQL to SPL
A certain table in the MS SQL database has a multi-level self-association structure, where the second...
Group and Summarize data, and align to the specified sequence #eg31
Below is temp_data table in Oracle database: LETTER is the foreign key field, which points to...
Getting members based on a specified condition #47
Find student records in the Scores table where SCORE is 90 or above. SPL script: A1 Connect to...
Multi-condition filtering #eg48
Find records of students in class one whose math score is 90 or above from Scores table. SPL...
Final association query solution
By rethinking and redefining the equi-joins, we are able to simplify the join syntax. A direct and...
Add records that meet the criteria before each group after grouping ：From SQL to SPL
In a certain view of the PostgreSQL database, the row_index field is an underscore separated string...
Introducing Gill: The Modern Solana JavaScript client library
Introduction Introducing Gill: The new javascript client library to interact with the...
Solana AMM Trading Bot: High-Speed DeFi Trading, Whale Tracking & Presale Strategies
If you’ve ever missed a Solana token presale by seconds or watched whales manipulate prices while...