在 Postgres 中过滤顶级 JSONB 数组文档？答案

【问题标题】：Filter a top level JSONB array document in Postgres?在 Postgres 中过滤顶级 JSONB 数组文档？
【发布时间】：2017-07-26 19:13:25
【问题描述】：

我有一个名为“events”的 Postgres 表，其中包含“id”、“name”、“invoices”列：

                                           Table "public.events"
        Column         |            Type             |                           Modifiers
-----------------------+-----------------------------+---------------------------------------------------------------
 id                    | integer                     | not null default nextval('events_id_seq'::regclass)
 name                  | character varying(255)      | not null
 invoices              | jsonb                       | not null

每一行都有一个 jsonb 类型的 invoices 列，其中一个数组作为顶级元素：

Example Content:

[{"InvoiceId":4,"CustomerId":14,"InvoiceDate":"2009-01-06T00:00:00","BillingAddress":"8210 111 ST NW","BillingCity":"Edmonton","BillingState":"AB","BillingCountry":"Canada","BillingPostalCode":"T6G 2C7","Total":8.91}, 
 {"InvoiceId":5,"CustomerId":23,"InvoiceDate":"2009-01-11T00:00:00","BillingAddress":"69 Salem Street","BillingCity":"Boston","BillingState":"MA","BillingCountry":"USA","BillingPostalCode":"2113","Total":13.86}, 
 {"InvoiceId":8,"CustomerId":40,"InvoiceDate":"2009-02-01T00:00:00","BillingAddress":"8, Rue Hanovre","BillingCity":"Paris","BillingState":null,"BillingCountry":"France","BillingPostalCode":"75002","Total":1.98}, 
 {"InvoiceId":9,"CustomerId":42,"InvoiceDate":"2009-02-02T00:00:00","BillingAddress":"9, Place Louis Barthou","BillingCity":"Bordeaux","BillingState":null,"BillingCountry":"France","BillingPostalCode":"33000","Total":3.96}, 
 {"InvoiceId":10,"CustomerId":46,"InvoiceDate":"2009-02-03T00:00:00","BillingAddress":"3 Chatham Street","BillingCity":"Dublin","BillingState":"Dublin","BillingCountry":"Ireland","BillingPostalCode":null,"Total":5.94}, 
 {"InvoiceId":11,"CustomerId":52,"InvoiceDate":"2009-02-06T00:00:00","BillingAddress":"202 Hoxton Street","BillingCity":"London","BillingState":null,"BillingCountry":"United Kingdom","BillingPostalCode":"N1 5LH","Total":8.91}, 
 {"InvoiceId":13,"CustomerId":16,"InvoiceDate":"2009-02-19T00:00:00","BillingAddress":"1600 Amphitheatre Parkway","BillingCity":"Mountain View","BillingState":"CA","BillingCountry":"USA","BillingPostalCode":"94043-1351","Total":0.99}, 
 {"InvoiceId":14,"CustomerId":17,"InvoiceDate":"2009-03-04T00:00:00","BillingAddress":"1 Microsoft Way","BillingCity":"Redmond","BillingState":"WA","BillingCountry":"USA","BillingPostalCode":"98052-8300","Total":1.98}, 
 {"InvoiceId":15,"CustomerId":19,"InvoiceDate":"2009-03-04T00:00:00","BillingAddress":"1 Infinite Loop","BillingCity":"Cupertino","BillingState":"CA","BillingCountry":"USA","BillingPostalCode":"95014","Total":1.98}, 
 {"InvoiceId":16,"CustomerId":21,"InvoiceDate":"2009-03-05T00:00:00","BillingAddress":"801 W 4th Street","BillingCity":"Reno","BillingState":"NV","BillingCountry":"USA","BillingPostalCode":"89503","Total":3.96}]

如何返回一个请求集，其中包含每行 id、名称和“总计”大于 5.00 的发票数组的列表？

【问题讨论】：

您是指所有发票大于 5 的事件？或所有发票总和大于 5 的事件？并仅过滤大于 5 的发票或返回所有发票而不考虑总数？

标签： arrays json postgresql postgresql-9.4

【解决方案1】：

select id, name, invoices
from
    events
    cross join lateral
    jsonb_array_elements(invoices) o (o)
group by 1,2,3
having sum((o ->> 'Total')::numeric > 5)

【讨论】：