(data->'scores')::jsonb->>0:将scores数组转换为JSONB类型,并获取第一个元素。 ->>'score':获取该元素中的score字段的值。 SUM(...):计算所有数学成绩的总和。 参考链接 PostgreSQL JSON Functions and Operators 通过以上方法,你可以对嵌套的JSON数据进行各种聚合操作,并解决在处理复杂JSON数据时遇到的问题...
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Add array_to_json and row_to_json functions. Also move the escape_json function from explain.c to json.c where it seems to belong. Andrew Dunstan, Reviewed by Abhijit Menon-Sen.@dunslane.net> 事实上Postgres 内核对JSON字段的处理是将其存储为文本字段 (对大为1GB) ,更重要的是字符串格式校验...
Note:array_to_jsonandrow_to_jsonhave the same behavior asto_jsonexcept for offering a pretty-printing option. The behavior described forto_jsonlikewise applies to each individual value converted by the other JSON creation functions. Note:Thehstoreextension has a cast fromhstoretojson, so thaths...
,我们可以看到,JSON Path一般结合匹配的函数或者操作符使用,这时可以将其看成简单的字符串参数。...作为操作符PG中关于JSON PATH有那些相关的功能和函数在JSON章节中,我们已经提到,下面由两个操作符,需要配合JSON Path进行使用:jsonb @?...在路径字符串中,还可以...
// create the actual type, specifying the input and output functions extension_sql!( r#" CREATE TYPE vector ( INPUT = vector_input, OUTPUT = vector_output, TYPMOD_IN = vector_modifier_input, TYPMOD_OUT = vector_modifier_output, STORAGE = external ); "#, name = "concrete_type", creat...
# linux的默认配置,书上推荐使用csv格式#log_destination = 'stderr' # Valid values are combinations of# stderr, csvlog, jsonlog, syslog, and# eventlog, depending on platform.# csvlog and jsonlog require# logging_collector to be on.# This is used when logging to stderr:logging_collector ...
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Featuring regep_split_to_array and recursive functions. These functions even have terminal animations! Advent of Code - Day 17 SQL Solutions for Day 17 of Advent of Code. This one uses jsonb and arrays to keep track of points. Advent of Code - Day 16 SQL Solutions for Day 16 of ...
let value = match serde_json::from_str::<Vec<f64>>( input.to_str().expect("expect input to be UTF-8 encoded"), ) { Ok(v) => v, Err(e) => { pgrx::error!("failed to deserialize the input string due to error {}", e) ...