SQL also recognizes the special column ROWLABEL, which Trusted Oracle database version 7 creates for every database table. Like other columns, ROWLABEL can be referenced in SQL statements. However, with standard Oracle, ROWLABEL returns a null. With Trusted Oracle database version 7, ROWLABEL ...
E Oracle SQL Reserved Words and Keywords F Extended Examples Index3 Pseudocolumns A pseudocolumn behaves like a table column, but is not actually stored in the table. You can select from pseudocolumns, but you cannot insert, update, or delete their values. A pseudocolumn is also similar ...
When you refer to an XMLTable construct without the COLUMNS clause, or when you use the TABLE collection expression to refer to a scalar nested table type, the database returns a virtual table with a single column. This name of this pseudocolumn is COLUMN_VALUE. In the context of XML...
Pseudocolumns are virtual columns or expression calculators, the expression being a constant or another expression.Gavin PowellCarol McCullough-DieterOracle SQL: Jumpstart with Examples
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, ...
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...
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BuildSqlSelect(columns ...string) q.BuildSqlSelectStar() q.BuildSqlInsert() q.BuildSqlInsertColumnsAndValues(columns []string, values []interface{}) q.BuildSqlInsertModel() q.BuildSqlUpdate() q.BuildSqlUpdateModelByPrimaryKey() q.BuildSqlDelete() q.BuildSqlDeleteModelByPrimaryKey() ) ...
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 To define a hierarchical relationship in a query, you must use theCONNECTBYclause...
図3-1に、逆ツリーのノードとそれらのLEVEL値を示します。 図3-1 階層ツリー 「図3-1 階層ツリー」の説明 関連項目: 階層問合せの概要は、階層問合せを参照してください。LEVEL疑似列の使用に関する制限事項は、IN条件を参照してください。 前のページ 次のページ...