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Load when writing or debugging ClickHouse SQL, including backtick identifiers, ClickHouse casts, date bucket functions, string matching, aggregate functions, and engine-specific limitations.
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Add a new MCP server preset (connector) to Mako's MCP client system — server URL, auth model (OAuth DCR, pre-registered app, or API key), scopes, icon, tests, and docs. Use when connecting a new external MCP server (like Slack or Close CRM) or changing how MCP connections authenticate.
| name | dialect-clickhouse |
| description | Load when writing or debugging ClickHouse SQL, including backtick identifiers, ClickHouse casts, date bucket functions, string matching, aggregate functions, and engine-specific limitations. |
| entities | ["clickhouse","sql","toStartOfMonth","formatDateTime","countIf","sumIf"] |
Use this skill for ClickHouse connections.
| Feature | ClickHouse syntax | Notes |
|---|---|---|
| Identifiers | `column` | Backticks are safest for reserved or mixed-case names. |
| Type casts | toUInt32(x), toString(x), CAST(x, 'Type') | Prefer typed conversion functions when clear. |
| String concat | concat(a, b) | Not PostgreSQL ` |
| Pattern match | LIKE, match(value, 'regex') | match uses RE2-style regex. |
| Date bucket | toStartOfHour(ts), toStartOfDay(ts), toStartOfMonth(ts) | Use these instead of date_trunc. |
| Date format | formatDateTime(ts, '%Y-%m') | Similar strftime-style tokens. |
| Conditional aggregate | countIf(condition), sumIf(value, condition) | Prefer native combinators for concise analytics. |
Some older ClickHouse versions have limited window function support. If a window query fails, rewrite with grouped subqueries or array functions.
SELECT
toStartOfMonth(created_at) AS month,
status,
count() AS order_count,
sum(total_amount) AS revenue
FROM `orders`
WHERE created_at >= now() - INTERVAL 6 MONTH
GROUP BY month, status
ORDER BY month, status
LIMIT 500;