Scripts

Technical Article

While Loop in T-SQL

Often, we encounter situations where we need to loop through a dataset to process or update records iteratively. In such cases, I use WHILE loop like below. The example below demonstrates how a WHILE loop can be used to iterate Sales records. This approach is particularly effective when working with a numerical or date column, […]

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2024-10-15

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Technical Article

Comprehensive SQL Performance Monitoring and Optimisation Script

This script monitors and reports the execution statistics of SQL statements over a specified period, capturing metrics such as execution counts, CPU time, I/O operations, and elapsed time. It provides a comprehensive view of query performance, aiding in the diagnosis of performance issues and identifying problematic SQL queries in the database.

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2024-07-29 (first published: )

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Technical Article

Creating a CSV Parser in Apex

Salesforce supports the conversion of only csv files utilizing Apex. However if you use their LWC - js platform that provides wide options to bring in libraries to parse all kinds of file types. Here in this script i would be providing basic idea of functions utilizing the parsing logic along with options to iterate […]

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2024-05-21

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return:

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

See possible answers