ClickHouse/docs/zh/operations/system-tables/functions.md

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# system.functions {#system-functions}
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包含有关常规函数和聚合函数的信息。
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列:
- `name`(`String`) The name of the function.
- `is_aggregate`(`UInt8`) — Whether the function is aggregate.
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**举例**
```
SELECT * FROM system.functions LIMIT 10;
```
```
┌─name─────────────────────┬─is_aggregate─┬─case_insensitive─┬─alias_to─┐
│ sumburConsistentHash │ 0 │ 0 │ │
│ kostikConsistentHash │ 0 │ 0 │ │
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│ demangle │ 0 │ 0 │ │
│ addressToLine │ 0 │ 0 │ │
│ JSONExtractRaw │ 0 │ 0 │ │
│ JSONExtractKeysAndValues │ 0 │ 0 │ │
│ JSONExtract │ 0 │ 0 │ │
│ JSONExtractString │ 0 │ 0 │ │
│ JSONExtractFloat │ 0 │ 0 │ │
│ JSONExtractInt │ 0 │ 0 │ │
└──────────────────────────┴──────────────┴──────────────────┴──────────┘
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10 rows in set. Elapsed: 0.002 sec.
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```