fix(Postgres Node): Remove reusable connections (no-changelog) (#6259)

packages/nodes-base/nodes/Postgres/v2/actions/database/upsert.operation.ts

@@ -1,5 +1,6 @@
 import type { IExecuteFunctions } from 'n8n-core';
 import type { IDataObject, INodeExecutionData, INodeProperties } from 'n8n-workflow';
+import { NodeOperationError } from 'n8n-workflow';
 
 import { updateDisplayOptions } from '../../../../../utils/utilities';
 
@@ -179,6 +180,20 @@ export async function execute(
 			item[columnToMatchOn] = this.getNodeParameter('valueToMatchOn', i) as string;
 		}
 
+		if (!item[columnToMatchOn]) {
+			throw new NodeOperationError(
+				this.getNode(),
+				"Column to match on not found in input item. Add a column to match on or set the 'Data Mode' to 'Define Below' to define the value to match on.",
+			);
+		}
+
+		if (item[columnToMatchOn] && Object.keys(item).length === 1) {
+			throw new NodeOperationError(
+				this.getNode(),
+				"Add values to update or insert to the input item or set the 'Data Mode' to 'Define Below' to define the values to insert or update.",
+			);
+		}
+
 		const tableSchema = await getTableSchema(db, schema, table);
 
 		item = checkItemAgainstSchema(this.getNode(), item, tableSchema, i);