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Update window-functions doc with denseRank and percentRank aliases

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Peter Nguyen 2024-07-30 17:17:01 -06:00
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docs/en/sql-reference/window-functions/index.md
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@ -23,8 +23,8 @@ ClickHouse supports the standard grammar for defining windows and window functio
| `INTERVAL` syntax for `DateTime` `RANGE OFFSET` frame | ❌ (specify the number of seconds instead (`RANGE` works with any numeric type).) |
| `GROUPS` frame | ❌ |
| Calculating aggregate functions over a frame (`sum(value) over (order by time)`) | ✅ (All aggregate functions are supported) |
| `rank()`, `dense_rank()`, `row_number()` | ✅ |
| `percent_rank()` | ✅ Efficiently computes the relative standing of a value within a partition in a dataset. This function effectively replaces the more verbose and computationally intensive manual SQL calculation expressed as `ifNull((rank() OVER(PARTITION BY x ORDER BY y) - 1) / nullif(count(1) OVER(PARTITION BY x) - 1, 0), 0)`|
| `rank()`, `dense_rank()`, `row_number()` | ✅ <br/>Alias: `denseRank()` |
| `percent_rank()` | ✅ Efficiently computes the relative standing of a value within a partition in a dataset. This function effectively replaces the more verbose and computationally intensive manual SQL calculation expressed as `ifNull((rank() OVER(PARTITION BY x ORDER BY y) - 1) / nullif(count(1) OVER(PARTITION BY x) - 1, 0), 0)` <br/>Alias: `percentRank()`|
| `lag/lead(value, offset)` | ❌ <br/> You can use one of the following workarounds:<br/> 1) `any(value) over (.... rows between <offset> preceding and <offset> preceding)`, or `following` for `lead` <br/> 2) `lagInFrame/leadInFrame`, which are analogous, but respect the window frame. To get behavior identical to `lag/lead`, use `rows between unbounded preceding and unbounded following` |
| ntile(buckets) | ✅ <br/> Specify window like, (partition by x order by y rows between unbounded preceding and unrounded following). |