postgresql

pg中提取字符串中字段

复制代码
SELECT
    (regexp_matches('{"newValue":"字数为15个字的用例自定义状态","oldKey":"0","fieldName":"statusName","newKey":"118","oldValue":"新建"}', '"oldKey":"([^"]*)"'))[1] AS old_key,
    (regexp_matches('{"newValue":"字数为15个字的用例自定义状态","oldKey":"0","fieldName":"statusName","newKey":"118","oldValue":"新建"}', '"fieldName":"([^"]*)"'))[1] AS field_name,
    (regexp_matches('{"newValue":"字数为15个字的用例自定义状态","oldKey":"0","fieldName":"statusName","newKey":"118","oldValue":"新建"}', '"oldValue":"([^"]*)"'))[1] AS old_value,
    (regexp_matches('{"newValue":"字数为15个字的用例自定义状态","oldKey":"0","fieldName":"statusName","newKey":"118","oldValue":"新建"}', '"newKey":"([^"]*)"'))[1] AS newKey,
    (regexp_matches('{"newValue":"字数为15个字的用例自定义状态","oldKey":"0","fieldName":"statusName","newKey":"118","oldValue":"新建"}', '"newValue":"([^"]*)"'))[1] AS newValue

查看进程

复制代码
SELECT *
FROM pg_stat_activity
WHERE state = 'active'
;

一行转一列,类似侧视图功能

复制代码
select
            regexp_split_to_table(
               '6992560,6992506,6992505,6992504,6992503,6992502,6992469,6992501,6992468,6992500,6992467,6992466,6992465,6992464,6992463,6992462,6992461,6992509,6992508,6992507,6992517,6992516,6992515,6992119,6992514,6992118,6992513,6992117,6992512,6992116,6992479,6992511,6992115,6992478,6992510,6992114,6992477,6992113,6992476,6992112,6992475,6992111,6992474,6992473,6992472,6992471,6992470,6992519,6992518,6992528,6992527,6992526,6992525,6992129,6992524,6992128,6992523,6992127,6992489,6992522,6992126,6992488,6992521,6992125,6992487,6992520,6992124,6992486,6992123,6992122,6992485,6992121,6992484,6992120,6992483,6992482,6992481,6992480,6992490,6992529,6992539,6992538,6992537,6992536,6992535,6992534,6992533,6992499,6992532,6992498,6992531,6992135,6992497,6992530,6992134,6992496,6992133,6992495,6992132,6992494,6992131,6992493,6992130,6992492,6992491,6992549,6992548,6992547,6992546,6992545,6992544,6992543,6992542,6992541,6992540,6992559,6992558,6992557,6992556,6992555,6992554,6992553,6992552,6992551,6992550'
                , ',')

一列转一行,需要分组(组内 一列转一行)

复制代码
类似hive中
select id,concat_ws(',',collect_list(name)) names from ts group by id;

pg

复制代码
WITH temp_table(id, num, name) AS (
  VALUES
    (1, 'zs', '合肥'),
    (1, 'ls', '南京'),
    (1, 'ww', '杭州'),
    (1, 'zl', '重庆'),
    (1, 'sq', '郑州'),
    (2, 'wb', '六安'),
    (2, 'lq', '青岛'),
    (3, 'dd', '三亚'),
    (3, 'si', '常州'),
    (3, 'sh', '武汉')
)
SELECT id,string_agg(name,',')
FROM temp_table
group by id;
相关推荐
颜如玉16 分钟前
🤲🏻🤲🏻🤲🏻临时重定向一定要能重定向🤲🏻🤲🏻🤲🏻
java·http·源码
程序员的世界你不懂2 小时前
【Flask】测试平台开发,新增说明书编写和展示功能 第二十三篇
java·前端·数据库
星空寻流年2 小时前
设计模式第一章(建造者模式)
java·设计模式·建造者模式
鳄鱼杆2 小时前
服务器 | Docker应用开发与部署的实践以及阿里云镜像加速配置
服务器·阿里云·docker
lingchen19062 小时前
MATLAB的数值计算(三)曲线拟合与插值
开发语言·matlab
羚羊角uou2 小时前
【Linux】命名管道
linux·运维·服务器
gb42152872 小时前
java中将租户ID包装为JSQLParser的StringValue表达式对象,JSQLParser指的是?
java·开发语言·python
一朵梨花压海棠go2 小时前
html+js实现表格本地筛选
开发语言·javascript·html·ecmascript
曾经的三心草3 小时前
Python2-工具安装使用-anaconda-jupyter-PyCharm-Matplotlib
android·java·服务器
蒋星熠3 小时前
Flutter跨平台工程实践与原理透视:从渲染引擎到高质产物
开发语言·python·算法·flutter·设计模式·性能优化·硬件工程