SQL Diagnostics and Optimization

Fix queries, tune indexes, and map functions in one lab.

Paste one query and run focused analyzers for syntax repair, index opportunities, and function portability guidance.

Shared SQL Workspace

Use this one input for all tools below. Choose target server style for compatibility-oriented fixes.

Target Server for Compatibility Suggestions Lab Status Ready

SQL Workspace Input

Lab Tools with Detailed Explanation

1) SQL Error Fix Assistant

Detects common syntax and cross-dialect compatibility problems, then suggests practical rewrites.

What it checks: invalid equality operators, trailing commas, identifier quoting, date/null function mismatches, pagination grammar, auto-increment style, and suspicious quote/parenthesis balance.

Why users love it: it gives both a fixed output and a reason card for every change, so they can learn while solving production issues.

Suggested Fixed SQL

Run analysis to see fix suggestions and warning notes.

2) Index Suggestion Checker

Extracts query patterns from WHERE/JOIN/GROUP BY/ORDER BY and recommends candidate indexes.

What it checks: filter keys, join keys, sort keys, grouping keys, plus query anti-pattern tips such as SELECT * and leading wildcard LIKE.

Why users love it: quick index candidates with readable CREATE INDEX statements save time during tuning and migration.

Run checker to receive index candidates and performance guidance.

3) Function Equivalents Finder

Looks up SQL function families and maps equivalent syntax for all supported server styles.

What it checks: datetime, null handling, date arithmetic, concatenation, string length, substring, and random value generation.

Why users love it: function portability is one of the biggest migration blockers, and this gives immediate side-by-side mapping.

Function Name

Search a function to compare equivalent syntax across databases.

Advanced SQL Productivity Workspace

Tools 4 to 7 now live on a dedicated page with deeper explanations and focused workflows.

Included there: SQL Formatter + Minifier, SQL Lint Rules Panel, Query Compare Tool, and SQL Complexity Snapshot.

Why separate: this keeps SQL Lab focused on diagnostics while giving productivity tools more room for practical guidance and examples.

Open SQL Productivity Tools