在PostgreSQL中,Oracle的CONNECT_BY_ROOT函数没有直接等效的实例。Oracle的CONNECT_BY_ROOT函数用于在自连接查询中获取根节点的值,而PostgreSQL中没有类似的功能。 然而,在PostgreSQL中,可以使用递归查询来实现类似的功能。以下是一个示例: 假设我们有一个表格tree,包含两列:id和parent_id。我们想要获取每个节点的...
Oracle connect by语法支持异构查询,其中包含了一些特殊的变量:CONNECT_BY_ROOT、CONNECT_BY_ISLEAF、SYS_CONNECT_BY_PATH、CONNECT_BY_ISCYCLE、LEVEL。 https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries003.htm#i2053935 https://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumn...
insert into tab_connect_by (CHILD, PARENT) values(15, 38); insert into tab_connect_by (CHILD, PARENT) values(17, 38); insert into tab_connect_by (CHILD, PARENT) values(6, 38); insert into tab_connect_by (CHILD, PARENT) values(13, 26); insert into tab_connect_by (CHILD, PARENT...
从Root往树末梢递归 select*fromTBL_TESTstartwithid=1connectbyprior id = pid; 从1开始往下搜索,应该得到1,2,4,5 id | name | pid ---+---+---1 | 10 | 02 | 11 | 15 | 121 | 24 | 12 | 1(4 rows) 从末梢往树ROOT递归 select*fromTBL_TESTstartwithid=5connectbyprior pid = id; ...
Master_User: uuu //授权帐户名,尽量避免使用root Master_Port: 3306 //数据库端口,部分版本没有此行 Connect_Retry: 60 Master_Log_File: mysql-bin.000003 Read_Master_Log_Pos: 600 //同步读取二进制日志的位置 Relay_Log_File: ddte-relay-bin.000003 ...
一、数据库常用命令1.登录 PostgreSQL 数据库: psql -U postgres -h localhost -p 5432 mydatabase 2.登陆到指定数据库 psql -U root -d mydatabase; 3.查看表和数据: 3.1 列出所有数据库: \l 3.2 连接
CONNECT_BY_ROOT is a unary operator that is valid only in hierarchical queries. When you qualify a column with this operator, Oracle returns the column value using data from the root row. See the following query: SELECT emp_no,ename,job,manager_no,level,SYS_CONNECT_BY_PATH (ename,';')...
SUBSTR(SYS_CONNECT_BY_PATH(ar.NAME,'/'),2) path--SYS_CONNECT_BY_PATH ( ar.NAME, '/' ) pathFROMEMS_AREA ar STARTWITHar.ID='<ROOT>'CONNECTBYPRIOR ID=ar.PARENT_ID withRECURSIVE cteas(selectA.REF_ID,A.ID,cast(A.nameasvarchar(100))aspathfromEMS_AREA Awherea.id='<ROOT>'unionall...
默认为 ~/.postgresql/root.crt。This parameter specifies the name of a file containing SSL certificate authority (CA) certificate(s). If the file exists, the server's certificate will be verified to be signed by one of these authorities. The default is ~/.postgresql/root.crt. ...
Oracle中START / WITH / CONNECT BY提供分层查询的能力,从START WITH开始遍历记录,递归查询结果集直到拿到所有满足条件的结果。 例如下面测试数据: 代码语言:javascript 复制 drop table sr_menu;create tablesr_menu(idnumber(10)notnull,parentnumber(10),titlevarchar2(50));insert into sr_menuvalues(1,null,...