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

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# system.functions {#system-functions}
Contains information about normal and aggregate functions.
Columns:
- `name`(`String`) The name of the function.
- `is_aggregate`(`UInt8`) — Whether the function is aggregate.
**Example**
```sql
SELECT * FROM system.functions LIMIT 10;
```
```text
┌─name─────────────────────┬─is_aggregate─┬─case_insensitive─┬─alias_to─┐
│ sumburConsistentHash │ 0 │ 0 │ │
│ yandexConsistentHash │ 0 │ 0 │ │
│ demangle │ 0 │ 0 │ │
│ addressToLine │ 0 │ 0 │ │
│ JSONExtractRaw │ 0 │ 0 │ │
│ JSONExtractKeysAndValues │ 0 │ 0 │ │
│ JSONExtract │ 0 │ 0 │ │
│ JSONExtractString │ 0 │ 0 │ │
│ JSONExtractFloat │ 0 │ 0 │ │
│ JSONExtractInt │ 0 │ 0 │ │
└──────────────────────────┴──────────────┴──────────────────┴──────────┘
2021-07-29 15:20:55 +00:00
10 rows in set. Elapsed: 0.002 sec.
2021-06-24 12:47:02 +00:00
```
[Original article](https://clickhouse.com/docs/en/operations/system-tables/functions) <!--hide-->