CREATE TABLE large_objects ( id SERIAL PRIMARY KEY, data BYTEA ); -- 插入二进制数据 INSERT INTO large_objects (data) VALUES (DECODE('hex_data', 'hex')); -- 将十六进制数据转换为二进制 -- 检索二进制数据 SELECT data FROM large_objects; 数据分区 当表中的数据量非常大时,可以进行数据分区...
("append") d -- DELETE D -- TRUNCATE x -- REFERENCES t -- TRIGGER X -- EXECUTE U -- USAGE C -- CREATE c -- CONNECT T -- TEMPORARY arwdDxt -- ALL PRIVILEGES (for tables, varies for other objects) * -- grant option for preceding privilege /yyyy -- role that granted this ...
Large Objects ... psql登录使用-E可查看元命令对应的SQL语句 [postgres@centos79~]$psqlpostgres-Epsql(14.12)Type"help"forhelp.postgres=#\l***QUERY***SELECTd.datnameas"Name",pg_catalog.pg_get_userbyid(d.datdba)as"Owner",pg_catalog.pg_encoding_to_char(d.encoding)as"Encoding",d.datcollate...
{ "dependent_objects_still_exist", ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST }, { "invalid_transaction_termination", ERRCODE_INVALID_TRANSACTION_TERMINATION }, { "sql_routine_exception", ERRCODE_SQL_ROUTINE_EXCEPTION }, { "function_executed_no_return_statement", ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_...
1、从大小排列 database cluster-->databases-->schema-->objects2、Tablespace是数据最大的存储空间, Database是构成表空间的存储单元,pages是 PostgreSQL数据库中最小的IO单元 1.3 逻辑结构管理 1.3.1 数据库 1.3.1.1 创建数据库 create database name ...
objects.aggregate(arr=ArrayAgg('somefield')) {'arr': [0, 1, 2]} 通用聚合选项 所有聚合体都有 filter 关键字参数。通用聚合函数¶ ArrayAgg¶ class ArrayAgg(expression, distinct=False, filter=None, ordering=(), **extra)¶ 返回一个值的列表,包括空值,连接成一个数组。 distinct¶ 一个...
=NULL)smgrrelease(reln);}/** smgrreleaseall() -- Release resources used by all objects.*/voidsmgrreleaseall(void){HASH_SEQ_STATUSstatus;SMgrRelationreln;/* Nothing to do if hashtable not set up */if(SMgrRelationHash==NULL)return;hash_seq_init(&status,SMgrRelationHash);while((reln=(...
Type: array of objects(AdditionalColumns) (or Expression with resultType array of objects). Overrides: PostgreSqlSource.withAdditionalColumns(Object additionalColumns) Parameters: additionalColumns withDisableMetricsCollection public PostgreSqlSource withDisableMetricsCollection(Object disableMetricsCollection) Set...
objects.filter(tags__overlap=['thoughts']) <QuerySet [<Post: First post>, <Post: Second post>]> >>> Post.objects.filter(tags__overlap=['thoughts', 'tutorial']) <QuerySet [<Post: First post>, <Post: Second post>, <Post: Third post>]> len¶ Returns the length of the array....
FROM gv$locked_object l, dba_objects o, gv$session s WHERE l.object_id = o.object_id AND l.session_id = s.sid; 3、查询行锁语句 select sql_text from v$sql a,v$session b where a.sql_id=b.sql_id and b.event='enq: TX - row lock contention'; ...