What is SQL collection?

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.

Which collection we can use in SQL?

PL/SQL uses three types of collections: associative arrays, nested tables, and varrays.

What are Oracle collections used for?

To use collections in an application, you define one or more PL/SQL types, then define variables of those types. You can define collection types in a procedure, function, or package. You can pass collection variables as parameters to stored subprograms.

What are the types of collection in PL SQL?

PL/SQL has three collection types—associative array, VARRAY (variable-size array), and nested table.

What are the collection methods in Oracle?

A collection method is a built-in function or procedure that operates on collections and is called using dot notation. 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.

How do you make a nested table?

Click inside any cell in the larger table. Once again, use the “Insert” tab to create a table. For example, click on cell 1, go to “Insert,” “Table” and then create a 2-by-2 table. This 2-by-2 is now nested inside of the 3-by-3.

What is a nested table in Oracle?

Within the database, nested tables can be considered one-column database tables. Oracle stores the rows of a nested table in no particular order. But, when you retrieve the nested table into a PL/SQL variable, the rows are given consecutive subscripts starting at 1. That gives you array-like access to individual rows.

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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.

How does Oracle SQL loader work?

SQL*Loader uses the field specifications in the control file to interpret the format of the datafile, parse the input data, and populate the bind arrays that correspond to a SQL INSERT statement using that data. The Oracle database accepts the data and executes the INSERT statement to store the data in the database.

How do I insert a row in a cell in Word?

Click in a cell above or below where you want to add a row. Under Table Tools, on the Layout tab, do one of the following: To add a row above the cell, click Insert Above in the Rows and Columns group. To add a row below the cell, click Insert Below in the Rows and Columns group.

How do I insert a cell within a cell in Word?

Inserting Cells in a Table
  1. Select the cell before which you want a cell inserted.
  2. Choose Insert Cells from the Table menu. You will see the Insert Cells dialog box.
  3. Select which way you want the cells to be adjusted.
  4. Click on OK.

What is coalesce in Oracle SQL?

COALESCE returns the first non-null expr in the expression list. At least one expr must not be the literal NULL . If all occurrences of expr evaluate to null, then the function returns null. Oracle Database uses short-circuit evaluation.

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What is cursor in MySQL?

MySQL cursor is a kind of loop facility given to traverse in the result of SQL one by one. We can operate on every result by using the cursor in MySQL. Cursors are supported in stored procedures, functions, and triggers only. MySQL cursor is available from version 5 or greater.

What is a function in Plsql?

A stored function (also called a user function or user-defined function) is a set of PL/SQL statements you can call by name. Stored functions are very similar to procedures, except that a function returns a value to the environment in which it is called. User functions can be used as part of a SQL expression.

How do I run a control file in PuTTY?

Log on to redstart using SSH or PuTTY. To run the control files use the following command at the prompt: [[email protected] username]$ sqlldr sxxxxxx/password, control=filename.

How do I import a CSV file into Oracle Database using SQL Loader?

Import csv into database table (SQL* Loader)
  1. Create a table inside database which will be used for rows to import from csv file.
  2. Create a sample csv file at OS level on your database server.
  3. Put some dummy data into the csv file.
  4. Save the .csv file and close it.
  5. Create sql loader control file with .ctl extension.

What tool do you use to fill a cell with color?

Select the cell or range of cells you want to format. Click Home > Format Cells dialog launcher, or press Ctrl+Shift+F. On the Fill tab, under Background Color, pick the color you want.

How do you delete a single cell in Word?

Right-click in a table cell, row, or column you want to delete. On the menu, click Delete Cells. To delete one cell, choose Shift cells left or Shift cells up.

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How do you delete rows in Word?

  1. Click a row or cell in the table, and then click the Table Layout tab.
  2. Under Rows & Columns, click Delete, and then click Delete Rows.

oracle plsql records and collections introduction to oracle collections

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