n8n/docs/workflows/update-postgres-rows.json

{
  "nodes": [
    {
      "parameters": {},
      "name": "Start",
      "type": "n8n-nodes-base.start",
      "typeVersion": 1,
      "position": [
        250,
        300
      ]
    },
    {
      "parameters": {
        "functionCode": "const newItems = [];\nfor (let i=1;i < 6; i++) {\n  newItems.push({\n    json: {\n      id: i,\n      name: `New name ${i}`,\n      ean: `New EAN ${i}`,\n    }\n  });\n}\nreturn newItems;"
      },
      "name": "Function1",
      "type": "n8n-nodes-base.function",
      "typeVersion": 1,
      "position": [
        460,
        300
      ]
    },
    {
      "parameters": {
        "operation": "update",
        "table": "product",
        "columns": "name,ean"
      },
      "name": "Update Rows",
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 1,
      "position": [
        610,
        300
      ],
      "credentials": {
        "postgres": "postgres"
      }
    }
  ],
  "connections": {
    "Function1": {
      "main": [
        [
          {
            "node": "Update Rows",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}