General MySQL Oracle SQL Server

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Open and Close an Explicit Cursor in Oracle
How To Open and Close an Explicit Cursor in Oracle? An existing cursor can be opened or closed by the OPEN or CLOSE statement as shown in the following sample script: DECLARE CURSOR c_list IS SELECT * FROM countries; CURSOR t_list IS SELECT * FROM employees WHERE employee_id = 100; BEGIN OPEN c_list... 2018-07-22, 2539🔥, 0💬

Privilege to Query Tables in Another Schema in Oracle
What Privilege Is Needed for a User to Query Tables in Another Schema in Oracle? For a user to run queries (SELECT statements) on tables of someone else's schema, he/she needs the SELECT ANY TABLE privilege. The following tutorial exercise gives you a good example of granting "dev" to query tables i... 2019-06-11, 2537🔥, 0💬

Recycle Bin - Storage to Hold Dropped Tables in Oracle
What Is Recycle Bin in Oracle? Recycle bin is a logical storage to hold the tables that have been dropped from the database, in case it was dropped in error. Tables in recycle bin can be recovered back into database by the Flashback Drop action. Oracle database recycle save the same purpose as the r... 2019-05-14, 2537🔥, 0💬

Left Outer Join with the WHERE Clause in Oracle
How To Write a Left Outer Join with the WHERE Clause in Oracle? If you don't want to use the LEFT OUTER JOIN ... ON clause to write a left outer join, you can use a special criteria in the WHERE clause as "left_table.column = right_table.column(+)". The select statement below is an example of a left... 2019-10-18, 2536🔥, 0💬

in Oracle
How To Delete All Rows from a Table in Oracle? If you want to delete all rows from a table, you have two options: Use the DELETE statement with no WHERE clause. Use the TRUNCATE TABLE statement. The TRUNCATE statement is more efficient the DELETE statement. The tutorial exercise shows you a good exa... 2020-01-04, 2535🔥, 0💬

Drop an Existing Table in Oracle
How To Drop an Existing Table in Oracle? If you want to delete an existing table and its data rows, you can use the DROP TABLE statement as shown in this script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREATE TABLE emp_dept_10 2 AS SELECT * FROM employees WHERE department_id=10; Tabl... 2019-05-25, 2530🔥, 0💬

Example of Passing Parameters to Procedures in Oracle
How To Pass Parameters to Procedures in Oracle? Store procedures or functions can take parameters. You need to define parameters while defining the procedure, and providing values to parameters while calling the procedure. The script below shows you how to do this: SQL&gt; CREATE OR REPLACE PROC... 2019-03-08, 2530🔥, 0💬

Rename a Tablespace in Oracle
How To Rename a Tablespace in Oracle? You can easily rename a tablespace by using the ALTER TABLESPACE ... RENAME TO statement as shown in the example below: SQL&gt; CREATE TABLESPACE my_space 2 DATAFILE '/temp/my_space.dbf' SIZE 10M; Tablespace created. SQL&gt; ALTER TABLESPACE my_space REN... 2019-04-13, 2529🔥, 0💬

What Is a User Account in Oracle
What Is a User Account in Oracle? A user account is identified by a user name and defines the user's attributes, including the following: Password for database authentication Privileges and roles Default tablespace for database objects Default temporary tablespace for query processing work space   ⇒... 2020-07-07, 2528🔥, 0💬

Transaction Commit When Session Ended in Oracle
What Happens to the Current Transaction If the Session Is Ended in Oracle? If a session is ended, the current transaction in that session will be committed and ended. All the database changes made in the current transaction will become permanent. This is called an implicit commit when session is end... 2019-08-23, 2527🔥, 0💬

Simplest Tool to Run Commands on Oracle Server in Oracle
What Is the Simplest Tool to Run Commands on Oracle Servers in Oracle? The simplest tool to connect to an Oracle server and run commands to manage data is SQL*Plus. It is an Oracle database client tool that works as a command-line user interface to the database server. SQL*Plus allows you: Format, p... 2018-06-27, 2526🔥, 0💬

Show Execution Path Reports in Oracle
How To Get Execution Path Reports on Query Statements in Oracle? If your user account has autotrace configured by the DBA, you can use the "SET AUTOTRACE ON EXPLAIN" command to turn on execution path reports on query statements. The tutorial exercise bellow shows you a good example: SQL&gt; CONN... 2020-06-08, 2520🔥, 0💬

Create a New Table in Your Schema in Oracle
How To Create a New Table in Your Schema in Oracle? If you want to create a new table in your own schema, you can log into the server with your account, and use the CREATE TABLE statement. The following script shows you how to create a table: &gt;.\bin\sqlplus /nolog SQL&gt; connect HR/fyice... 2019-06-01, 2520🔥, 0💬

Use SQL Statements in PL/SQL in Oracle
How To Use SQL Statements in PL/SQL in Oracle? SQL DML (Data Manipulation Language) statements can be included in PL/SQL code blocks directly without any changes. See the script below for examples: SQL&gt; CREATE TABLE tip (id NUMBER(5) PRIMARY KEY, 2 subject VARCHAR(80) NOT NULL, 3 description ... 2019-03-08, 2517🔥, 0💬

Experiments of Data Locks in Oracle
How To Experiment a Data Lock in Oracle? If you want to have some experience with data locks, you can create two windows running two SQL*Plus sessions. In session 1, you can run a UPDATE statements to create a data lock. Before committing session 2, switch to session 2, and run a UPDATE statements o... 2019-08-08, 2516🔥, 0💬

Attributes of the Implicit Cursor in Oracle
How To Use Attributes of the Implicit Cursor in Oracle? Right after executing a DML statement, you retrieve any attribute of the implicit cursor by using SQL%attribute_name, as shown in the following tutorial exercise: CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name VARCHAR(80) NOT NULL, ... 2018-02-01, 2516🔥, 0💬

Use DML Statements in PL/SQL in Oracle
Can DML Statements Be Used in PL/SQL in Oracle? Yes, you can run almost any DML statements in PL/SQL directly. To manipulate Oracle database data you can include INSERT, UPDATE, and DELETE statements, directly in PL/SQL programs, without any special notation, as shown in the following sample code: (... 2018-10-13, 2511🔥, 0💬

Scope of Local Variables in Oracle
What Is the Scope of a Local Variable in Oracle? The scope of a variable can be described with these rules: A variable is valid within the procedure or function where it is defined. A variable is also valid inside a sub procedure or function defined. If a variable name is collided with another varia... 2018-10-13, 2506🔥, 0💬

Lock and Unlock a User Account in Oracle
How To Lock and Unlock a User Account in Oracle? If you want to lock a user account for a short period of time, and unlock it later, you can use the ALTER USER ... ACCOUNT command. The following sample script shows how to use this command: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyic... 2019-06-29, 2502🔥, 0💬

PL/SQL Procedure in Oracle
What Is a Procedure in Oracle? A procedure is a named program unit. It consists of three parts: Declaration Part - Defining the procedure name, calling parameters, local variables and local procedures. Declaration part is required. Execution Part - Defining execution logic with executable statements... 2018-11-29, 2502🔥, 0💬

Types of Cursors Supported in PL/SQL in Oracle
How Many Types of Cursors Supported in PL/SQL in Oracle? PL/SQL supports two types of cursors: The implicit cursor - A single default cursor that automatically connects to the last DML statement executed. Explicit cursors - User defined cursors with specific DML statements and execution statuses.   ... 2018-02-01, 2502🔥, 0💬

Create an Oracle Database Manually in Oracle
How To Create an Oracle Database Manually in Oracle? Based on Oracle's Administrator Guide, there are 11 steps to create a database with the CREATE DATABASE statement: Step 1: Decide on Your Instance Identifier (SID) Step 2: Establish the Database Administrator Authentication Method Step 3: Create t... 2019-04-03, 2498🔥, 0💬

What Do You Think about Oracle SQL Developer in Oracle
What Do You Think about Oracle SQL Developer in Oracle? To conclude this introductory FAQ collection, you should think about Oracle SQL Developer in comparison with other client tools like SQL*Plus and Oracle Web interface. SQL Developer is definitely better than the other tools, more functionality,... 2018-12-26, 2498🔥, 0💬

Omit Columns in INSERT Statements in Oracle
How To Omit Columns with Default Values in INSERT Statement in Oracle? If you don't want to specify values for columns that have default values, or you want to specify values to columns in an order different than how they are defined, you can provide a column list in the INSERT statement. If a colum... 2020-01-29, 2497🔥, 0💬

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General MySQL Oracle SQL Server