How do you loop through a column in PL SQL?

PROCEDURE dropNullColumns AS l_query VARCHAR2(10000); all_row_count NUMBER; null_row_count NUMBER; BEGIN SELECT count(*) INTO all_row_count FROM PreparedDocumentFeaturesValues; FOR columnItem IN (SELECT column_name FROM all_tab_columns WHERE TABLE_NAME = UPPER(‘PreparedDocumentFeaturesValues’)) LOOP SELECT count(*) …

How do you repeat a command in Sqlplus?

You can either use the “/” key to re-run the last command, or you can type “ed” and enter to edit the last command. Then when you are finished editing, save the changes, and when you return to the SQL> command prompt, just hit the “/” key again. To: Multiple recipients of list ORACLE-L sqlplus session?

Can you loop in Oracle SQL?

LOOP statements execute a sequence of statements multiple times. The LOOP and END LOOP keywords enclose the statements. PL/SQL provides four kinds of loop statements: basic loop, WHILE loop, FOR loop, and cursor FOR loop.

What is cursor FOR loop in Oracle?

The cursor FOR LOOP statement implicitly declares its loop index as a record variable of the row type that a specified cursor returns, and then opens a cursor. With each iteration, the cursor FOR LOOP statement fetches a row from the result set into the record.

How do I run a cursor in Oracle?

How to use Explicit Cursor?

  1. DECLARE the cursor in the Declaration section.
  2. OPEN the cursor in the Execution Section.
  3. FETCH the data from the cursor into PL/SQL variables or records in the Execution Section.
  4. CLOSE the cursor in the Execution Section before you end the PL/SQL Block.

What are SQL*Plus commands?

SQL*Plus commands allow a user to manipulate and submit SQL statements. Specifically, they enable a user to: Enter, edit, store, retrieve, and run SQL statements. List the column definitions for any table.

How do I use arrow keys in Sqlplus?

SQL*Plus Command History Key Display

  1. In UNIX and Linux, you can use the up-arrow key to display the command history, but the up-arrow key does not work when you are inside SQL*Plus.
  2. To enable the up arrow key for Oracle you need to install a special package and the up arrow key will then work inside Oracle.

How do I run a loop in Oracle SQL Developer?

Syntax

  1. The initial step is executed first, and only once. This step allows you to declare and initialize any loop control variables.
  2. Next, the condition, i.e., initial_value ..
  3. After the body of the for loop executes, the value of the counter variable is increased or decreased.
  4. The condition is now evaluated again.

How do you create a loop in PL SQL?

PL/SQL For Loop Example 2

  1. DECLARE.
  2. VAR1 NUMBER;
  3. BEGIN.
  4. VAR1:=10;
  5. FOR VAR2 IN 1..10.
  6. LOOP.
  7. DBMS_OUTPUT.PUT_LINE (VAR1*VAR2);
  8. END LOOP;

Can select be used as a loop?

Using a Select Loop. The select loop allows the program to perform a computation for each selected row, rather than to display results to you, as in the select to a form, table field, record, or array statement.