PostgreSQL 中匹配逗号分隔的ID字符串, 使用 array,string_to_array,any 场景:两张表,books 和 tags 表,一个 book 对应多个 tag。但是 book 把 tag 信息存在一个字符串中,用逗号分隔。 如何匹配这种数据 代码演示 -- 建表createtablebooks( idvarchar(32), namevarchar(25
1. postgresql 某字段用逗号分隔,查询某个值是否在其中 比如有个字段值是 1,2,3 查看1是否在里面 select id, gate_type, gate_name from yg_gate_base_b where'1' = ANY ( STRING_TO_ARRAY( gate_type, ',') ) order by gate_type desc 2. postgresql 某字段用逗号分隔,关联表查询 比如一个表,...
',') from sys_dict_data sdd where CAST(sdd.dict_code as VARCHAR)= ANY(string_to_array( int...
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() function accepts a string as the first argument, splits it into array elements, and concatenates the array elements using a delimiter/separator. The separator can be any value, such as white space, comma, semi-colon, etc. This write-up explained Postgres' STRING_TO_ARRAY() function ...
string_to_array ( string text, delimiter text [, null_string text ] ) → text[] string_to_array('xx~~yy~~zz', '~~', 'yy')→ {xx,NULL,zz}将数组展开为一组行。unnest ( anyarray ) → setof anyelement unnest(ARRAY[1,2]) → 1 2...
1 || ARRAY[[2, 3]] 结果:报错 数组的函数 array_cat(anyarray, anyarray) 连接两个数组,返回新数组 示例:array_cat(ARRAY[1, 2], ARRAY[3, 4]) 结果:{1, 2, 3, 4} array_cat(ARRAY[[1, 2]], ARRAY[3, 4]) 结果:{{1, 2}, {3, 4}} ...
方法二:array_to_string(ARRAY_AGG() ,':') 例:select array_to_string(ARRAY_AGG(NAME) ,':') from sql_user_test GROUP BY age; 1. 方法三:自定义group_count()函数,不推荐使用,效率没有string_agg()高 CREATE AGGREGATE GROUP_CONCAT(anyelement) ...
Data Export:Prepare array data for export by converting it to a delimited string. Prepare array data for export by converting it to a delimited string. Syntax: array_to_string(anyarray, text [, text]) Return Type: text PostgreSQL Version: 9.3 ...
PostgreSQL锁机制保障多会话并发访问时的数据一致性,通过MVCC减少锁争用。表级锁包括ACCESS SHARE、ROW EXCLUSIVE等八种模式,行级锁如FOR UPDATE阻塞写入。锁冲突可能导致死锁,需按固定顺序获取锁预防。pg_locks系统视图可监控锁状态,劝告锁由应用控制。PostgreSQL锁分.