Article Outline
TOC
Collection Outline
[BIGQUERY] 分析入門
[BIGQUERY] SQL
■ 関数
- approx_count_distinct()
- coalesce()
- countif()
- extract()
- ifnull()
- lead() / lag()
- left() / right()
- lower()
- nullif()
- parse_date()
- percentile_()
- row_number()
- safe_cast()
- split()
- st_distance()
- struct()
- unnest()
■ 演算子
■ 句（節）
■ BigQuery特有
■ ERROR
- To copy a table, the destination and source datasets must be in the same region. Copy an entire dataset to move data between regions.
- Resources exceeded during query execution: Not enough resources for query planning - too many subqueries or query is too complex
[BIGQUERY] ML
[BIGQUERY] DS
■ DS100ノック
■
[BIGQUERY] GA
|| lead()
LEAD ( scalar_expression [ ,offset(1) ] , [ default(null) ] )
OVER ( [ partition_by_clause ] order_by_clause )現在行の後ろの行を持ってくる。
現在行の前の行を持ってくる。のは lag()。
|| 用途
- 前日比や、前週比
- コホート分析
|| Cf.
- 【BigQuery】LAG関数，LEAD関数の使い方 - Qiita
- LEAD (Transact-SQL) - Microsoft
- Analytic function concepts - Google Cloud
- Navigation functions - LEAD - Google Cloud
