
Lookup row with ClickHouse
Check if a row exists in your ClickHouse database.

Update row with ClickHouse
Update rows in a ClickHouse table matching a WHERE clause. Runs as a synchronous mutation (ALTER TABLE ... UPDATE), which can be slow on large tables.

Upsert row with ClickHouse
Upsert a row into a ClickHouse table. Inserts via JSONEachRow; deduplication is handled by the table engine, so the target should be a ReplacingMergeTree-family table (otherwise duplicate rows are not collapsed).













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