A pseudo-column is an Oracle assigned value (pseudo-field) used in the same context as an Oracle Database column, but not stored on disk. SQL and PL/SQL recognizes the following SQL pseudocolumns, which return specific data items: SYSDATE, SYSTIMESTAMP, ROWID, ROWNUM, UID, USER, LEVEL,...
Oracle For Beginners -INDEXING, CLUSTERING, SEQUENCE AND PSEUDO COLUMNSorecal sequence seminar
1 Introduction to Oracle SQL 2 Basic Elements of Oracle SQL 3 Pseudocolumns Hierarchical Query Pseudocolumns Sequence Pseudocolumns Version Query Pseudocolumns COLUMN_VALUE Pseudocolumn OBJECT_ID Pseudocolumn OBJECT_VALUE Pseudocolumn ORA_ROWSCN Pseudocolumn ROWID Pseudocolumn ROWNUM Pseudocolumn XMLDATA Ps...
Oracle/ Oracle Database/ Release 18 SQL Language Reference The hierarchical query pseudocolumns are valid only in hierarchical queries. The hierarchical query pseudocolumns are: CONNECT_BY_ISCYCLE Pseudocolumn CONNECT_BY_ISLEAF Pseudocolumn LEVEL Pseudocolumn ...
Oracle Compatibility Overview Basic SQL Elements Pseudocolumns Operators Expressions Conditions Common SQL DDL Clauses SQL Queries and Subqueries PL/SQL Language System Functions System Views Advanced Packages User Roles and Permissions Deployment Solutions ...
database. Tables are made up of rows of data, each consisting of one or more columns, so it stands to reason that Oracle Database would make it as easy as possible to work with those rows of data inside a PL/SQL program. And it does precisely that through its implementation of the...
java.sql.PseudoColumnUsage 实现的所有接口 Serializable, Comparable<PseudoColumnUsage> public enum PseudoColumnUsage extends Enum<PseudoColumnUsage> 伪/隐藏列使用的枚举。 从以下版本开始: 1.7 另请参见: DatabaseMetaData.getPseudoColumns(java.lang.String, java.lang.String, java.lang.String, ...
Pseudocolumns are virtual columns or expression calculators, the expression being a constant or another expression.Gavin PowellCarol McCullough-DieterOracle SQL: Jumpstart with Examples
The pseudo/hidden column may only be used in a WHERE clause. NO_USAGE_RESTRICTIONS public static final PseudoColumnUsage NO_USAGE_RESTRICTIONS There are no restrictions on the usage of the pseudo/hidden columns. USAGE_UNKNOWN public static final PseudoColumnUsage USAGE_UNKNOWN The usage of the...
TimesTen Scaleoutでサポートされているその他の疑似列の詳細は、『Oracle TimesTen In-Memory Database SQLリファレンス』のTimesTen Scaleoutの疑似列を参照してください。 次の例があります。 replicaSetId#を使用したデータの検索 複製分散スキームの表でのreplicaSetId#の使用 replicaSetId#を使用...