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バージョン: 3.3

hll_cardinality

説明​

単一の HLL 型の値の基数を計算します。

構文​

HLL_CARDINALITY(hll)

例​

MySQL > select HLL_CARDINALITY(uv_set) from test_uv;
+---------------------------+
| hll_cardinality(`uv_set`) |
+---------------------------+
|                         3 |
+---------------------------+

キーワード​

HLL,HLL_CARDINALITY

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