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‎README.md‎

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Multi-database schema comparison and migration CLI tool. Supports **PostgreSQL**, **MySQL**, and **SQL Server**.
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Live page: [merup.me/dbdiff](https://merup.me/dbdiff/)
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DBDiff keeps schema comparison and migration generation in one CLI so you can inspect drift, review the generated SQL, and move forward without bouncing between separate tools or dialect-specific scripts.
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## Features
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- Compare database schemas between two instances

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‎docs/index.html‎

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>DBDiff | Compare database schemas and generate migration SQL</title>
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<meta
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name="description"
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content="DBDiff compares PostgreSQL, MySQL, and SQL Server schemas and generates migration SQL with dialect-aware output."
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/>
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<meta property="og:title" content="DBDiff | Compare database schemas and generate migration SQL" />
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<meta
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property="og:description"
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content="Diff two database schemas, review the generated migration plan, and keep the workflow in one CLI across PostgreSQL, MySQL, and SQL Server."
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/>
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<meta property="og:type" content="website" />
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<meta property="og:url" content="https://merup.me/dbdiff/" />
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<link rel="preconnect" href="https://fonts.googleapis.com" />
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
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<link
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href="https://fonts.googleapis.com/css2?family=Syne:wght@500;600;700;800&family=Source+Code+Pro:wght@400;500&display=swap"
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rel="stylesheet"
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/>
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<link rel="stylesheet" href="./styles.css" />
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</head>
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<body>
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<div class="page">
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<header class="topbar">
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<a class="brand" href="https://github.com/Meru143/dbdiff">DBDiff</a>
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<nav>
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<a href="#compare">Compare</a>
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<a href="#dialects">Dialects</a>
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<a href="#install">Install</a>
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<a href="https://github.com/Meru143/dbdiff">GitHub</a>
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</nav>
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</header>
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<main>
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<section class="hero">
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<div class="hero-copy">
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<p class="eyebrow">Schema diff and migration SQL</p>
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<h1>Review the schema drift before you run the migration.</h1>
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<p class="lede">
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DBDiff compares two databases, highlights structural differences, and generates
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dialect-aware migration SQL for PostgreSQL, MySQL, and SQL Server from one CLI.
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</p>
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<div class="actions">
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<a class="button primary" href="https://github.com/Meru143/dbdiff">Star on GitHub</a>
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<a class="button secondary" href="#install">Install DBDiff</a>
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</div>
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</div>
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<div class="schema-board">
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<div class="schema-card source">
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<p class="label">Source</p>
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<pre><code>users
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id bigint pk
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email text unique
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name text
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created_at timestamptz</code></pre>
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</div>
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<div class="schema-card target">
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<p class="label">Target</p>
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<pre><code>users
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id bigint pk
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email varchar(255) unique
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display_name text
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created_at timestamptz
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updated_at timestamptz</code></pre>
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</div>
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<div class="schema-card sql">
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<p class="label">Generated SQL</p>
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<pre><code>ALTER TABLE users
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RENAME COLUMN name TO display_name;
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ALTER TABLE users
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ADD COLUMN updated_at timestamptz;</code></pre>
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</div>
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</div>
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</section>
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<section id="compare" class="section">
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<div class="section-head">
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<p class="eyebrow">Compare</p>
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<h2>One CLI for schema inspection, SQL generation, and safer review loops.</h2>
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<p>
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The practical win is speed of review. Instead of flipping between different tools
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for inspection and migration output, DBDiff keeps the diff, the dialect, and the
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generated SQL in one flow.
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</p>
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</div>
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<div class="cards">
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<article class="card">
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<h3>Diff first</h3>
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<p>Compare two instances before you touch production and catch drift while it is still explainable.</p>
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</article>
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<article class="card">
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<h3>Generate SQL</h3>
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<p>Produce migration scripts in SQL, JSON, or table output depending on where the result needs to go next.</p>
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</article>
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<article class="card">
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<h3>Dry run by default</h3>
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<p>Review is the default posture, which makes it easier to trust the tool inside a delivery workflow.</p>
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</article>
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</div>
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</section>
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<section id="dialects" class="section split">
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<div class="section-head">
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<p class="eyebrow">Dialects</p>
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<h2>PostgreSQL, MySQL, and SQL Server with dialect-aware DDL.</h2>
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<p>
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The tool is useful precisely because it does not flatten everything to one generic
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SQL dialect. It keeps the generated statements close to the actual target platform.
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</p>
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</div>
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<div class="dialect-grid">
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<div class="dialect">
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<span>PostgreSQL</span>
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<p>`ALTER COLUMN TYPE`, schema-aware introspection, and transaction-friendly flows.</p>
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</div>
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<div class="dialect">
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<span>MySQL</span>
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<p>`MODIFY COLUMN` generation and MySQL-specific comparison behavior.</p>
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</div>
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<div class="dialect">
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<span>SQL Server</span>
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<p>Cross-instance diffing with SQL Server connection support built into the same CLI.</p>
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</div>
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</div>
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</section>
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<section id="install" class="section install">
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<div class="section-head">
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<p class="eyebrow">Install</p>
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<h2>Short path to the first diff.</h2>
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<p>
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Go install is the cleanest starting point. After that, compare two schemas and inspect
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the generated SQL before you wire the tool into a wider migration process.
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</p>
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</div>
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<div class="install-grid">
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<pre><code>go install github.com/meru143/dbdiff@latest
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dbdiff compare postgres://source postgres://target
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dbdiff migrate -s postgres://source -t postgres://target -o migration.sql</code></pre>
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<pre><code>Output modes:
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- sql
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- table
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- json
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- dry-run review first</code></pre>
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</div>
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</section>
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</main>
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</div>
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</body>
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</html>

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