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Sync data from Microsoft SQL Server to Customer.io

Activate your Microsoft SQL Server data by syncing it directly into Customer.io. With Weld's reverse ETL, you can push modelled data such as audience segments, lead scores and account metrics from your database into Customer.io, making it actionable for your team without manual exports or CSV uploads.

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4.8 on G2
Microsoft SQL ServerWarehouse
WeldWeld
Customer.ioDestination
Weld · Reverse ETL
Microsoft SQL ServerSourceMicrosoft SQL ServerConnected
Models to send

Your own tables, picked when you set up the sync.

  • Model
  • Map fields
  • Upsert
Customer.ioDestinationCustomer.ioReady
Objects updated
  • customer_io.Synced
  • customer_io.Syncing
  • customer_io.Synced
  • customer_io.Synced

Trusted by data and AI teams

  • Flatpay
  • Holafly
  • eComplete
  • Dishoom
  • Danish Endurance
  • Female Invest
  • Son of a Tailor
  • Onomondo
  • Medik8
  • Pas Normal Studios
How it works

How to set up Microsoft SQL Server to Customer.io in Weld.
Guided setup in 5 steps.

Full setup guide
  1. Step 01

    Connect your database

    Add Microsoft SQL Server as a data source in Weld with connection credentials that grant read access. Credentials are stored encrypted and never logged.

  2. Step 02

    Define your transformation

    Write a SQL query or dbt model that selects and transforms the data you want to push to Customer.io. This is where you build audience segments, compute lead scores, aggregate metrics, or reshape data into the structure Customer.io expects. You can preview results before activating.

  3. Step 03

    Connect Customer.io

    Authenticate Customer.io as a reverse ETL destination. Weld supports OAuth or API key authentication depending on the connector. Once connected, Weld automatically discovers the available objects and fields in Customer.io.

  4. Step 04

    Map fields and configure sync

    Map your SQL columns to Customer.io fields using Weld's visual mapper. Choose a sync mode: insert to create new records, update to modify existing ones, or upsert to do both. Then set a schedule from every 5 minutes to daily.

  5. Step 05

    Activate and monitor

    Enable the sync and monitor it from the Weld dashboard. Track record counts, sync duration, and error rates in real time. Configure Slack or email alerts so you're notified immediately if a sync fails or encounters data quality issues.

Use cases

Why sync Microsoft SQL Server to Customer.io?
Act on warehouse data.

Push enriched segments and computed attributes from Microsoft SQL Server into Customer.io to power personalized outreach and targeted campaigns.

Keep Customer.io updated with the latest data from Microsoft SQL Server to automate workflows and reduce manual data entry.

  • Audience activation

    Build audiences from Microsoft SQL Server data and sync them to Customer.io for targeted campaigns without manual list exports.

  • Conversion tracking

    Send conversion events and offline purchase data from Microsoft SQL Server to Customer.io to improve attribution and ad optimization.

  • Operationalize analytics

    Turn insights from your database into action by pushing model outputs and metrics into Customer.io where your team works.

Data

What data can you sync?
From Microsoft SQL Server to Customer.io.

Model the data in Microsoft SQL Server with SQL or dbt, then map it to objects in Customer.io. Which objects you can write to depends on the Customer.io connector and your account permissions.

    Under the hood

    Technical considerations.
    What to expect.

    Sync modes
    Choose between insert, update, or upsert sync modes when pushing data to Customer.io. Upsert is recommended to avoid duplicates.
    Rate limits
    Weld respects Customer.io's API rate limits and automatically throttles requests to avoid hitting quotas.
    Data freshness
    Sync frequency depends on your Weld plan. Most connectors support schedules from every 5 minutes up to daily intervals.
    Security
    All data is encrypted in transit (TLS) and at rest. Weld is SOC 2 Type II compliant and supports IP whitelisting for database connections.
    Resources

    Keep reading.
    Guides, docs and schema.

    Documentation

    Microsoft SQL Server setup guide

    How to connect Microsoft SQL Server to Weld, step by step.

    Documentation

    Customer.io setup guide

    How to connect Customer.io to Weld, step by step.

    Connector

    Microsoft SQL Server connector

    Everything Weld does with Microsoft SQL Server.

    Connector

    Customer.io connector

    Everything Weld does with Customer.io.

    FAQ

    Common questions.
    About Microsoft SQL Server to Customer.io.

    Start syncing Microsoft SQL Server data to Customer.io.

    Set up your reverse ETL pipeline in minutes. No credit card required. Free for 14 days.

    Microsoft SQL ServerWarehouse
    WeldWeld
    Customer.ioDestination
    Start for freeTalk to us
    Related

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    More with Microsoft SQL Server and Customer.io.

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