PSLine2000Documentation/Queries/Query9.md

Query9

Analysis generated on: 4/2/2025 10:10:14 AM

SQL Statement

SELECT Left(Left([PN],Len([pn])-1)+"                    ",15) AS Part, filter2.PN, Process.PartNumber, Process.GrossWt, Process.ActualWt INTO filter3a
FROM filter2 LEFT JOIN Process ON filter2.PN = Process.PartNumber;

Dependencies

• Tables/filter2
• Tables/Process

Parameters

• None

What it does

SQL Query Explanation

Overview

This SQL query joins two tables, filter2 and Process, based on the PN column. It then selects and transforms data from both tables to create a new table, filter3a.

Step-by-Step Breakdown

1. Selecting Data

SELECT Left(Left([PN],Len([pn])-1)+" ",15) AS Part,

   This line selects the `PartNumber` column from both tables using a combination of `LEFT` and `LEN` functions.

   *   The outermost `LEFT` function takes two arguments: the column name (`[PN]`) and its length (`Len([pn])-1`). It returns the leftmost occurrence of the specified string within that column, truncating it to 15 characters (including leading spaces).
   *   The inner `LEFT` function applies the same logic to the `PartNumber` column from both tables.
2. **Joining Tables**
   ```sql
FROM filter2 LEFT JOIN Process ON filter2.PN = Process.PartNumber;

This line joins the two tables based on the common column PN.

• The LEFT JOIN returns all rows from filter2, and the matching rows from Process.
• If there is no match, the result set will contain NULL values for the columns from Process.

3. Creating a New Table

INTO filter3a

   This line creates a new table named `filter3a` to store the transformed data.

### Notes and Considerations

*   The query assumes that the column names in both tables are spelled consistently (e.g., `[PN]` vs. `PartNumber`).
*   The use of `LEFT` functions can lead to unexpected results if the specified string length is not consistent across all rows.
*   This query does not include any filtering or sorting criteria; it simply joins and transforms the data.

### Example Output

| Part | PN    | Process.PartNumber | Process.GrossWt | Process.ActualWt |
|------|-------|--------------------|------------------|-------------------|
|      | PN    | PartNumber         | GrossWt          | ActualWt          |
| ...  | ..... | .................... | ................... | ................... |

Note: The actual output will depend on the data in both `filter2` and `Process`.