postgresql

pg中提取字符串中字段

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

SELECT *
FROM pg_stat_activity
WHERE state = 'active'
;

一行转一列，类似侧视图功能

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)

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

pg

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;