How can I get column names from a table in PL SQL?

How can I get column names from a table in PL SQL?

SELECT column_name FROM all_tab_cols WHERE UPPER(Table_Name) = UPPER(‘tablename’); works just as well. Using lower(TABLE_NAME) or upper(TABLE_NAME) requires oracle to do a table scan of the ALL_TAB_COLUMNS table to get all values of TABLE_NAME before it can compare it to the supplied UPPER(‘MyTableName’) .

How do you initialize a collection in Oracle?

To initialize a nested table or varray, you use a constructor, a system-defined function with the same name as the collection type. This function “constructs” collections from the elements passed to it. You must explicitly call a constructor for each varray and nested table variable.

Is PL SQL record a collection type?

PL/SQL Records A record is a collection of data objects that are kept in fields, each having its own name and datatype. A record can be thought of as a variable that can store a table row or a set of columns from a table row. Table columns relate to the fields.

How do you assign a value to a collection in Oracle?

Assigning Collections

1. One collection can be assigned to another by an INSERT , UPDATE , FETCH , or SELECT statement, an assignment statement, or a subprogram call.
2. You can use operators such as SET , MULTISET UNION , MULTISET INTERSECT , and MULTISET EXCEPT to transform nested tables as part of an assignment statement.

What is collection in Oracle with example?

A collection is an ordered group of elements having the same data type. Each element is identified by a unique subscript that represents its position in the collection. PL/SQL provides three collection types − Index-by tables or Associative array. Nested table.

What are the PL SQL built in collection methods?

You can use the methods EXISTS , COUNT , LIMIT , FIRST , LAST , PRIOR , NEXT , EXTEND , TRIM , and DELETE to manage collections whose size is unknown or varies. EXISTS , COUNT , LIMIT , FIRST , LAST , PRIOR , and NEXT are functions that check the properties of a collection or individual collection elements.

How to get column names in PLSQL Stack Overflow?

Props to Eric, check this thread and his answer. Remember you can use DESC command to describe an Oracle Table, View, Synonym, package or Function. It will give you name, data_type and lengh.

How to insert data into a PL / SQL table type?

The following example, retrieves columns from a cursor into a collection: DECLARE TYPE NameList IS TABLE OF emp.ename%TYPE; names NameList; CURSOR c1 IS SELECT ename FROM emp WHERE job = ‘CLERK’; BEGIN OPEN c1; FETCH c1 BULK COLLECT INTO names; CLOSE c1; END;

Is it possible to specify which column you want to insert data to?

When inserting data into a SQL Server table, is it possible to specify which column you want to insert data to? I know you can have syntax like this: But the above syntax becomes unwieldy when you have lots of columns, especially if they have binary data. It becomes hard to match up which 1 and 0 go with which column.

How to insert into table values in Oracle?

Alternatively we can use a PL/SQL object defined against the target table. This uses a regular heap table for TBL_02: Assumming that columns in the table TBL_01 have the same names as names in the object declaration: