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最新文章列表
层次查询where条件容易混淆点
CREATE TABLE "AAA1"
(
"OID" VARCHAR2(50) NOT NULL,
"NAME" VARCHAR2(50),
"PID" VARCHAR2(50),
"SORT" INT,
"VERSION" CHAR(10),
PR ...
分层查询(Hierarchical Queries)
Hierarchical Queries
If a table contains hierarchical data, then you can select rows in a hierarchical order using the hierarchical query clause:
hierarchical_query_clause::=
start with condition
co ...
ORACLE层次查询学习
转自:http://blog.csdn.net/nsj820/article/details/6299276
层次查询的概念
语法格式:
select [level], column, expr... from table [where condition] start with condition connect by [prior column1= column2 | column ...