检索平面结果 - BigQuery 标准 SQL

Question

我在 bigQuery 中有以下标准 SQL 查询：

SELECT
    Chr,
    start_position,
    reference_bases,
    call.name,
    call.genotype,
    alternate_bases.alt,
    alternate_bases_CSQ_VT.*
FROM
    `mutable`,
    UNNEST(call) AS call,
    UNNEST(call.genotype) AS genotype,
    UNNEST(alternate_bases) AS alternate_bases,
    UNNEST(alternate_bases.CSQ_VT) AS alternate_bases_CSQ_VT
WHERE
    call.name = "sample name"
    AND CLIN_SIG = "pathogenic"
    AND genotype > 0
LIMIT
  100

returned 的 table 是平坦的，除了生成的基因型字段（每行 returned 有两条记录）。我想 return 一个平面 table，其中每行的两个基因型值被转换为两个新列（等位基因 1 和等位基因 2），但我正在努力寻找正确的方法。任何指针都会很棒

Answer 1

你的问题有点难以理解。通常，最好的方法是使用 UNNEST() 的子查询。我不太明白你的数据模型（查询和示例数据不一致）。但是，像这样：

SELECT . . . ,
       (SELECT MAX(call.name)
        FROM UNNEST(call) genotype
        WHERE call.genotype = 0
       ) as genotype_0,
       (SELECT MAX(call.name)
        FROM UNNEST(call) genotype
        WHERE call.genotype = 1
       ) as genotype_1
FROM `mutable`,
     UNNEST(alternate_bases) AS alternate_bases,
     UNNEST(alternate_bases.CSQ_VT) AS alternate_bases_CSQ_VT
WHERE call.name = 'sample name'
      CLIN_SIG = 'pathogenic'
LIMIT 100

Answer 2

我很感激你的回答我也会试试这个 - 很抱歉问题不太清楚。我确实想出了一个解决方案，虽然我不知道它是否有效。

SELECT
  Chr,
  start_position,
  reference_bases,
  call.name,
  call.genotype[OFFSET(0)] as all1,
  call.genotype[OFFSET(1)] as all2,
  alternate_bases.alt,
  alternate_bases_CSQ_VT.*
FROM
  `mutable`,
  UNNEST(call) AS call,
  UNNEST(call.genotype) AS genotype,
  UNNEST(alternate_bases) AS alternate_bases,
  UNNEST(alternate_bases.CSQ_VT) AS alternate_bases_CSQ_VT
WHERE
  call.name = "sample name"
  AND CLIN_SIG = "pathogenic"
  AND genotype > 0
LIMIT
  100

检索平面结果 - BigQuery 标准 SQL

Retrieving a flat result - BigQuery Standard SQL

sql

flatten

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