Oracle9i SQL Reference Release 2 (9.2) Part Number A96540-02 |
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A simple expression specifies column, pseudocolumn, constant, sequence number, or null.
simple_expression::=
In addition to the schema of a user, schema
can also be "PUBLIC
" (double quotation marks required), in which case it must qualify a public synonym for a table, view, or materialized view. Qualifying a public synonym with "PUBLIC
" is supported only in data manipulation language (DML) statements, not data definition language (DDL) statements.
The pseudocolumn
can be either LEVEL
, ROWID
, or ROWNUM
. You can use a pseudocolumn only with a table, not with a view or materialized view. NCHAR
and NVARCHAR2
are not valid pseudocolumn datatypes.
See Also:
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Some valid simple expressions are:
employees.last_name 'this is a text string' 10 N'this is an NCHAR string'