$ psql test# \dt//相当于mysql的,mysql>showtables;psql (12.2)Type "help"forhelp.test=# \dtListofrelationsSchema|Name|Type|Owner---+---+---+---public|cpc_sketch_test|table|csqjxiaopublic|test_table|table|csqjxiao(2rows)test=# \d test_tableTable"public.test_table"Column|Type|Collation...
用正则表达式替换regex，如果所需的字符串出现在列中，则该表达式为true，并在需要时展开模式列表。查询...
用正则表达式替换regex，如果所需的字符串出现在列中，则该表达式为true，并在需要时展开模式列表。查询...
id=0' union select 1,(select group_concat(table_name) from information_schema.tables where table_schema='security'),3 --+ 1. 爆字段名的语句 AI检测代码解析 ?id=0' union select 1,(select group_concat(column_name) from information_schema.columns where table_schema='security' and table_name...
PostgreSQL中的"分组"是一种用于对查询结果进行分组的操作。它类似于子查询,但是更加灵活和高效。 在SQL查询中,分组操作通常与聚合函数一起使用,以便对每个分组的数据进行计算和汇总。分组操作...
在INSERT INTO或者UPDATE的时候在最后面加上RETURNING colname,PostgreSQL会在插入或者更新数据之后会返回你指定的字段。 函数可以接收、返回多个字段,将这多个字段看作一个整体,称为复合类型。比如数据表中的一行,或者使用ROW构造函数构造的一行数据,或者以逗号分隔的多个字段。我们可以显式定义自己的复合类型,如: ...
Improved error handling behavior for relation does not exist and column does not exist errors. Fixed sp_tables stored procedure to correctly handle three-part object names across databases to retrieve correct database name during linked servers usage. Fixed an issue to enable database owner login ...
《PostgreSQL 10 新特性 - identity column (serial, 自增)》 XMLTABLE https://www.postgresql.org/docs/current/static/functions-xml.html#functions-xml-processing-xmltable xml的支持更加强大了。xmltable可以将XML解析为一张表输出。 CREATE TABLE xmldata AS SELECT xml $$ <ROWS> <ROW id="1"> <COUN...
SELECT pglogical.create_node( node_name := 'provider1', dsn := 'host=providerhost port=5432 dbname=db' ); Add all tables in public schema to the default replication set. SELECT pglogical.replication_set_add_all_tables('default', ARRAY['public']); Optionally you can also create additio...
Counter columns Each pg deployment would have their own individual copy of counter value. But when you read it, it would sum up all copys as the final value. When you runpgcat_setup_lww, it would: Add a new column__pgcat_lwwto the target table, which is injsonbtype, used to re...