ARRAY_TO_STRING()函数将数组转换为字符串。 STRING_TO_ARRAY()函数将字符串转换为数组。 示例代码: SELECT ARRAY_TO_STRING('{1, 2, 3}', ',') AS array_to_string, STRING_TO_ARRAY('apple,banana,cherry', ',') AS string_to_array; JSON 数据的处理 JSONB类型适合存储和处理 JSON 数据。 JSON...
on position( a1.prefix_id in '/'||array_to_string(a0.pathid,'/')||'/' ) >0 left outer join pg_stat_activity a2 -- select * from pg_stat_activity on a0.id = a2.pid order by '/'||array_to_string(a0.pathid,'/'),a0.depth; 输出结果格式如下: 附录三:查询当前执行时间超...
t2.relname AS references_table, array_to_string(c.confkey, ' ') AS fk_constraint_key FROM pg_constraint c LEFT JOIN pg_class t ON c.conrelid = t.oid LEFT JOIN pg_class t2 ON c.confrelid = t2.oid WHERE t.relname = '表名' AND c.conname = '约束名'; 8 列出相关的自增序列 ...
1.2 array_agg函数 array_agg函数和string_agg函数类似,最主要的区别为返回的类型为数组,数组数据类型同输入参数数据类型一致, array_agg函数支持两种语法,第一种如下所示: array_agg(expression) --输入参数为任何非数组类型 1. 输入参数可以是任何非数组类型,返回的结果是一维数组,array_agg函数将结果集某个字段...
pg_catalog.array_to_string(d.defaclacl, E', ')AS"Access privileges"FROMpg_catalog.pg_default_acl dLEFTJOINpg_catalog.pg_namespace nONn.oid=d.defaclnamespaceWHEREn.nspname='abc'--指定 schemaORDERBY1,2,3; 5、案例:创建只读账号
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 crea
array_to_string(spcacl, E'\n') AS "Access privileges(访问权限)" --,spcoptions AS "Options(参数)" ,pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS "Size(表空间大小)" --,pg_catalog.shobj_description(oid, 'pg_tablespace') AS "Description(备注)" from pg_catalog.pg...
SELECTn.nspnameASschema,pg_catalog.format_type(t.oid,NULL)ASname,t.typnameASinternal_name,CASEWHENt.typrelid!=0THENCAST('tuple'ASpg_catalog.text)WHENt.typlen<0THENCAST('var'ASpg_catalog.text)ELSECAST(t.typlenASpg_catalog.text)ENDASsize,pg_catalog.array_to_string(ARRAY(SELECTe.enumlabel...
pg_catalog.array_to_string(d.defaclacl, E'\n') AS "Access privileges" FROM pg_catalog.pg_default_acl d LEFT JOIN pg_catalog.pg_namespace n ON n.oid = d.defaclnamespace ORDER BY 1, 2, 3; Owner | Schema | Type | Accessprivileges---+---+---+--- digoal | public | table ...
to: ' || pg_catalog.array_to_string( ARRAY( SELECT rolname FROM pg_catalog.pg_roles WHERE oid = ANY (polroles) ORDER BY 1 ), E', ') ELSE E'' END FROM pg_catalog.pg_policy pol WHERE polrelid = c.oid), E'\n') AS "Policies" FROM pg_catalog.pg_class c LEFT JOIN pg_...