Comparing 2 records and show differences. (#2047)

* Add GlideReport for comparing 2 records

* Update: Show backend and display values; add scope note in README

* Update: Added system field check

Author: Rajasree2004

Core ServiceNow APIs/GlideRecord/Compare_2_records/README.md

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+# Compare Two Records Using GlideRecord (Global Scope)
+
+This snippet compares two records from the same table in ServiceNow field-by-field using the **GlideRecord API**.  
+It’s useful for debugging, verifying data after imports, or checking differences between two similar records.
+
+---
+
+## Working 
+The script:
+1. Retrieves two records using their `sys_id`.
+2. Includes or Excludes the system fields.
+2. Iterates over all fields in the record.
+3. Logs any fields where the values differ.
+
+---
+
+## Scope
+This script is designed to run in the Global scope.
+If used in a scoped application, ensure that the target table is accessible from that scope (cross-scope access must be allowed).
+
+## Usage
+Run this script in a **Background Script** or **Fix Script**:
+
+```js
+compareRecords('incident', 'sys_id_1_here', 'sys_id_2_here', false);
+```
+---
+## Example Output
+```js
+short_description: "Printer not working" vs "Printer offline"
+state: "In Progress" vs "Resolved"
+priority: "2" vs "3"
+Comparison complete.
+```
+

Core ServiceNow APIs/GlideRecord/Compare_2_records/compareRecords.js

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+/**
+ * Compare two records in a ServiceNow table field-by-field.
+ * Logs all field differences between the two records, including display values.
+ * 
+ * Parameters: 
+ * @param {string} table - Table name
+ * @param {string} sys_id1 - sys_id of first record
+ * @param {string} sys_id2 - sys_id of second record
+ * @param {boolean} includeSystemFields - true to compare system fields, false to skip them
+ * 
+ * Usage:
+ * compareRecords('incident', 'sys_id_1_here', 'sys_id_2_here', true/false);
+ */
+
+function compareRecords(table, sys_id1, sys_id2, includeSystemFields) {
+    var rec1 = new GlideRecord(table);
+    var rec2 = new GlideRecord(table);
+
+    if (!rec1.get(sys_id1) || !rec2.get(sys_id2)) {
+        gs.error('One or both sys_ids are invalid for table: ' + table);
+        return;
+    }
+
+    var fields = rec1.getFields();
+    gs.info('Comparing records in table: ' + table);
+
+    for (var i = 0; i < fields.size(); i++) {
+        var field = fields.get(i);
+        var fieldName = field.getName();
+        
+        if( !includeSystemFields && fieldName.startsWith('sys_') ) {
+            continue; 
+        }
+
+        var val1 = rec1.getValue(fieldName);
+        var val2 = rec2.getValue(fieldName);
+
+        var disp1 = rec1.getDisplayValue(fieldName);
+        var disp2 = rec2.getDisplayValue(fieldName);
+
+        if (val1 != val2) {
+            gs.info(
+                fieldName + ': Backend -> "' + val1 + '" vs "' + val2 + '", ' +
+                'Display -> "' + disp1 + '" vs "' + disp2 + '"'
+            );
+        }
+    }
+
+    gs.info('Comparison complete.');
+}
+
+// Example call
+compareRecords('incident', 'sys_id_1_here', 'sys_id_2_here', false);