In PostgreSQL, STRING_TO_ARRAY() is a built-in array function that accepts three arguments: a string, a delimiter, and a text to replace the null values. The STRING_TO_ARRAY() function accepts a string as the f
该函数还可以搭配array_to_string函数将数组转合并成一个字符串: 1 2 select array_to_string(array_agg(distinct ref_no), '&') from cnt_item where updated_on between '2021-05-05' and '2021-05-30 16:13:25'; --合并结果:ITM2105-000001&ITM2105-000002&ITM2105-000003 分割字符串 string_to_...
PostgreSQL POSITION() function PostgresQL ANY / SOME Operator ( IN vs ANY ) PostgreSQL Substring - Extracting a substring from a String How to add an auto-incrementing primary key to an existing table, in PostgreSQL PostgreSQL STRING_TO_ARRAY()function mysql FIND_IN_SET equivalent to postgresql...
1. STRING_TO_ARRAY STRING_TO_ARRAY函数将字符串分割为数组元素,并允许指定空字符串的替换值。 SELECTstring_to_array('xx~^~yy~^~zz','~^~');-- 返回 {xx,yy,zz}SELECTstring_to_array('xx~^~yy~^~zz','~^~','yy');-- 返回 {xx,NULL,zz} 1. 2. REGEXP_SPLIT_TO_ARRAY REGEXP_SPLIT_...
array_to_string(anyarray, text [, text])textconcatenates array elements using supplied delimiter and optional null stringarray_to_string(ARRAY[1, 2, 3, NULL, 5], ',', '*')1,2,3,*,5 array_upper(anyarray, int)intreturns upper bound of the requested array dimensionarray_upper(ARRAY[1...
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.
SELECTt.*frombas_cm_customer twhere'6651545956882725395'~ t.manager_idor'5722501350582149881'~ t.manager_id; SELECTt.*FROMbas_cm_customer tWHERE(string_to_array('6651545956882725395,5722501350582149881',',') && string_to_array(t.manager_id,','))...
今天FreeSql 为 PostgreSQL Array 数组类型提供了第六种新的导航属性 PgArrayToMany 专属功能。 --- ## 数组映射 FreeSql 支持 int[] 映射 int4[] string[] 映射 varchar[] DateTime[] 映射 timestamp[] ```c# class Model { public Guid Id { get; set; } ...
在PostgreSQL 上的SELECT查询以COPY (SELECT ...) TO STDOUT的方式在只读 PostgreSQL 事务中运行,每次SELECT查询后提交。 简单的WHERE子句,如=,!=,>,>=,<,<=,和IN是在PostgreSQL 服务器上执行。 所有的连接、聚合、排序、IN [ array ]条件和LIMIT采样约束都是在 PostgreSQL 的查询结束后才在ClickHouse中执行的...
Uses of the PostgreSQL ARRAY_TO_STRING() Function Concatenate Array Elements:Combine array elements into a single string with a specified delimiter. Handle Null Values:Replace null values in the array with a specified string during concatenation. ...