PSLine2000Documentation/Queries/CntlPanel4.md

CntlPanel4

Analysis generated on: 4/2/2025 9:57:46 AM

SQL Statement

SELECT Left$([PartNumber],7) AS pn, Process.*, Machines.*
FROM (CntlPanel3 LEFT JOIN Process ON CntlPanel3.PartNumber = Process.PartNumber) LEFT JOIN Machines ON Process.PartNumber = Machines.PartNumber
WHERE (((Machines.Prime)=Yes));

Dependencies

• Tables/Process
• Tables/Machines

Parameters

• None

What it does

SQL Query Description

Overview

This SQL query retrieves data from three tables: CntlPanel3, Process, and Machines. The query filters the results based on a condition involving the Prime column in the Machines table.

Breakdown

Table Joining

The query starts by joining two tables using LEFT JOIN: CntlPanel3 and Process. The join is based on the matching values in the PartNumber columns between these two tables. This creates a new temporary table with the data from both CntlPanel3 and Process.

Second Join

The query then performs another LEFT JOIN with the Machines table, this time linking it to the intermediate result from the previous join. The join is again based on matching values in the PartNumber column.

Filtering

The final step applies a filter condition using the WHERE clause:

• Only rows where the value in the Prime column of the Machines table is equal to 'Yes' (YES) are included in the results.
• The Left$() function extracts the first 7 characters from the PartNumber column.

Derived Column

A new derived column, pn, is created by taking the result of the Left$() function on the PartNumber column and assigning it an alias (AS pn). This allows for easier reference to the shortened part number in subsequent parts of the query or the final result set.

Result Set

The resulting data includes:

• The shortened PartNumber (7 characters) as pn.
• All columns from both the Process and Machines tables, but only rows where the Prime value is 'Yes'.

Example Use Case

Suppose you're analyzing inventory levels for parts used in manufacturing. This query would help identify which parts with a prime status are stored in certain machines or devices.

Code Explanation

-- Join CntlPanel3 and Process tables on PartNumber
FROM (CntlPanel3 LEFT JOIN Process ON CntlPanel3.PartNumber = Process.PartNumber)

-- Left join the result to Machines table based on Process.PartNumber
LEFT JOIN Machines ON Process.PartNumber = Machines.PartNumber

-- Filter results where Prime value is 'Yes'
WHERE (((Machines.Prime) = Yes));

In summary, this SQL query retrieves part information with a prime status from CntlPanel3, Process, and Machines tables.