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  "sql": "-- daily key statistics for one place from an ERDDAP griddap slab.\n--   s.\"precipitation\"  the value expression over the slab alias `s` (e.g. s.\"CRW_SST\", or\n--             (s.\"analysed_sst\" - 273.15) to convert Kelvin to Celsius)\n--   (SELECT DISTINCT * FROM read_parquet([<one griddap slab per lobe for the chunk>]))  the registered griddap file (parquet) or view\n--   mask  the mask table: latitude, longitude, weight (0,1]\n-- the join is an exact equality on ROUND(x, 3): the ERDDAP axis is float32 in the parquet and float64\n-- in the JS mask, so 21.375 arrives as 21.374999... on one side; rounding to the grid's 3 decimals\n-- (0.05 spacing) makes the two match without a tolerance join.\nSELECT\n  -- utc day; via epoch_ms because duckdb-wasm ships without icu, so TIMESTAMPTZ::DATE is unimplemented there\n  make_timestamp(epoch_ms(s.\"time\") * 1000)::DATE   AS date,\n  count(s.\"precipitation\")                                  AS n,\n  avg(s.\"precipitation\")                                    AS mean,\n  sum(s.\"precipitation\" * m.weight) / sum(m.weight)         AS mean_wt,\n  stddev_samp(s.\"precipitation\")                            AS sd,\n  min(s.\"precipitation\")                                    AS min,\n  max(s.\"precipitation\")                                    AS max,\n  quantile_cont(s.\"precipitation\", 0.10)                    AS p10,\n  quantile_cont(s.\"precipitation\", 0.90)                    AS p90,\n  sum(m.weight)                                     AS weight_sum\nFROM (SELECT DISTINCT * FROM read_parquet([<one griddap slab per lobe for the chunk>])) s\nJOIN mask m\n  ON  ROUND(s.latitude::DOUBLE,  3) = ROUND(m.latitude::DOUBLE,  3)\n  AND ROUND(s.longitude::DOUBLE, 3) = ROUND(m.longitude::DOUBLE, 3)\nWHERE s.\"precipitation\" IS NOT NULL\nGROUP BY 1\nORDER BY 1"
}