4/1/2023 0 Comments Oracle 11g most active tablesOur table has 5 columns, 4 of which are mandatory. SQL> CREATE TABLE nullability_test 2 ( c1 INT NOT NULL PRIMARY KEY 3, c2 INT NOT NULL 4, c3 INT CONSTRAINT column_level_check CHECK (c3 IS NOT NULL) 5, c4 INT 6, c5 INT 7, CONSTRAINT table_level_check CHECK (c4 IS NOT NULL) 8 ) the "not null" columns)? To help us to investigate and solve this problem, we will create a table with range of mandatory columns, as follows. We'll begin by trying to solve the following problem: what are all the mandatory columns in our schema (i.e. For this reason, we'll concentrate on these in this article and provide some solutions to workaround them. SELECT lists in subqueries in INSERT statementsÄespite the size of this list, we'll find that most of the time we are blocked by the two restrictions highlighted above.SELECT lists of subqueries or queries combined by the UNION, INTERSECT, or MINUS set operators.SELECT lists of queries containing GROUP BY clauses.SQL built-in functions, expressions, or conditions.The CLUSTER clause of a CREATE MATERIALIZED VIEW statement.The column list of a CREATE CLUSTER statement.The UNIQUE operator of a SELECT statement.GROUP BY clauses, ORDER BY clauses, or CONNECT BY clauses or with the DISTINCT operator in SELECT statements.In addition, LONG columns cannot appear in these parts of SQL statements: However, you can bind more than 4000 bytes of data to either the LONG or the LOB column. If a table has both LONG and LOB columns, then you cannot bind more than 4000 bytes of data to both the LONG and LOB columns in the same SQL statement.LONG and LONG RAW columns cannot be used in distributed SQL statements and cannot be replicated.Within a single SQL statement, all LONG columns, updated tables, and locked tables must be located on the same database.However, you cannot then call the program unit from SQL. You can declare a variable or argument of a PL/SQL program unit using the LONG data type.A stored function cannot return a LONG value.LONG data cannot be specified in regular expressions.LONG columns cannot appear in WHERE clauses or in integrity constraints (except that they can appear in NULL and NOT NULL constraints).
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