2021-04-29 03:46:32 +00:00
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# system.functions {#system-functions}
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2020-06-22 08:45:22 +00:00
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2021-04-29 03:46:32 +00:00
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包含有关常规函数和聚合函数的信息。
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2020-06-22 08:45:22 +00:00
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列:
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- `name`(`String`) – The name of the function.
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- `is_aggregate`(`UInt8`) — Whether the function is aggregate.
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2021-04-29 03:46:32 +00:00
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**举例**
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```
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SELECT * FROM system.functions LIMIT 10;
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```
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```
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┌─name─────────────────────┬─is_aggregate─┬─case_insensitive─┬─alias_to─┐
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│ sumburConsistentHash │ 0 │ 0 │ │
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│ yandexConsistentHash │ 0 │ 0 │ │
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│ demangle │ 0 │ 0 │ │
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│ addressToLine │ 0 │ 0 │ │
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│ JSONExtractRaw │ 0 │ 0 │ │
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│ JSONExtractKeysAndValues │ 0 │ 0 │ │
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│ JSONExtract │ 0 │ 0 │ │
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│ JSONExtractString │ 0 │ 0 │ │
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│ JSONExtractFloat │ 0 │ 0 │ │
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│ JSONExtractInt │ 0 │ 0 │ │
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└──────────────────────────┴──────────────┴──────────────────┴──────────┘
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2021-07-29 15:20:55 +00:00
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10 rows in set. Elapsed: 0.002 sec.
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2021-04-29 03:46:32 +00:00
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```
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