General MySQL Oracle SQL Server

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Process Query Result in PL/SQL in Oracle
How To Process Query Result in PL/SQL in Oracle? You can run queries (SELECT statements) in a PL/SQL code blocks, and process the results a loop as shown in the following script example: SQL&gt; set serveroutput on; SQL&gt; BEGIN 2 FOR row IN 3 (SELECT * FROM employees WHERE manager_id = 101... 2019-03-08, 2400🔥, 0💬

Define Anonymous Procedures with Variables in Oracle
How To Define an Anonymous Procedure with Variables in Oracle? Anonymous procedure is a procedure without any name. If you have some variables to declare, you can define an anonymous procedure by using the DECLARE keyword in SQL*Plus as shown in the following tutorial script: SQL&gt; set servero... 2018-01-27, 2400🔥, 0💬

Define a Sub Procedure in Oracle
How To Define a Sub Procedure in Oracle? A sub procedure is a named procedure defined and used inside another procedure or function. You need to define a sub procedure in the declaration part of the enclosing procedure or function. Sub procedure definition starts with the PROCEDURE key word. Here is... 2018-10-26, 2399🔥, 0💬

Query with a Full Outer Join in Oracle
How To Write a Query with a Full Outer Join in Oracle? If you want to query from two tables with a full outer join, you can use the FULL OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a full outer join from two tables: departments and employees. The join conditi... 2019-10-18, 2397🔥, 0💬

Managing Oracle Table Indexes
Where to find answers to frequently asked questions on Managing Oracle Table Indexes? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle Table Indexes. The clear answers and sample scripts provided can be used as learning tutorials or... 2019-05-10, 2397🔥, 0💬

Start Oracle SQL Developer in Oracle
How To Start Oracle SQL Developer in Oracle? To start Oracle SQL Developer, go to \sqldeveloper and click sqldeveloper.exe. The Oracle SQL Developer window shows up. Your copy of Oracle SQL Developer is running now. There will nothing under the Connections icon, because you haven't defined any conne... 2019-02-05, 2396🔥, 0💬

Start Oracle SQL Developer in Oracle
How To Start Oracle SQL Developer in Oracle? To start Oracle SQL Developer, go to \sqldeveloper and click sqldeveloper.exe. The Oracle SQL Developer window shows up. Your copy of Oracle SQL Developer is running now. There will nothing under the Connections icon, because you haven't defined any conne... 2019-02-05, 2396🔥, 0💬

Show All Tables in Your Schema in Oracle
How To List All Tables in Your Schema in Oracle? If you log in with your Oracle account, and you want to get a list of all tables in your schema, you can get it through the USER_TABLES view with a SELECT statement, as shown in the following SQL script: SQL&gt; connect HR/fyicenter Connected. SQL... 2019-05-10, 2395🔥, 0💬

Install Oracle SQL Developer in Oracle
How To Install Oracle SQL Developer in Oracle? Once you have sqldeveloper-v1.0.0.zip downloaded, extract the zip file into the root directory: \. When the extraction is done, the installation is completed. Your copy of Oracle SQL Developer is installed in directory: \sqldeveloper, and ready to run. ... 2019-02-05, 2395🔥, 0💬

Install Oracle SQL Developer in Oracle
How To Install Oracle SQL Developer in Oracle? Once you have sqldeveloper-v1.0.0.zip downloaded, extract the zip file into the root directory: \. When the extraction is done, the installation is completed. Your copy of Oracle SQL Developer is installed in directory: \sqldeveloper, and ready to run. ... 2019-02-05, 2395🔥, 0💬

Creating New Database Instance Manually
Where to find answers to frequently asked questions on Creating New Database Instance Manually? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on creating Oracle database instances manually using CREATE DATABASE statement. Items in this FAQ collecti... 2019-04-09, 2394🔥, 0💬

Unlock the Sample User Account in Oracle
How To Unlock the Sample User Account in Oracle? Your 10g XE server comes with a sample database user account called HR. But this account is locked. You must unlock it before you can use it: Log into the server home page as SYSTEM. Click the Administration icon, and then click Database Users. Click ... 2020-09-30, 2392🔥, 0💬

Pass a Cursor Variable to a Procedure in Oracle
How To Pass a Cursor Variable to a Procedure in Oracle? A cursor variable can be passed into a procedure like a normal variable. The sample script below gives you a good example: CREATE OR REPLACE PROCEDURE FYI_CENTER AS sys_cur SYS_REFCURSOR; PROCEDURE emp_print(cur SYS_REFCURSOR) AS emp_rec employ... 2018-07-18, 2392🔥, 0💬

How Oracle Handles Dead Locks in Oracle
How Oracle Handles Dead Locks in Oracle? Oracle server automatically detects dead locks. When a dead lock is detected, Oracle server will select a victim transaction, and fail its statement that is blocked in the dead lock to break the dead lock. The tutorial exercise below shows you an example of s... 2019-08-08, 2391🔥, 0💬

Use Subqueries with the EXISTS Operator in Oracle
How To Use Subqueries with the EXISTS Operator in Oracle? A subquery can be used with the EXISTS operator as "EXISTS (subquery)", which returns true if the subquery returns one or more rows. The following statement is a good example of "EXISTS (subquery)". It returns rows from employees table that t... 2019-09-27, 2390🔥, 0💬

Rename a Column in an Existing Table in Oracle
How To Rename a Column in an Existing Table in Oracle? Let's say you have an existing with an existing column, but you don't like the name of that column, can you rename that column name? The answer is yes. You can use the ALTER TABLE ... RENAME COLUMN statement to do this. See the following SQL scr... 2019-05-25, 2390🔥, 0💬

Convert Numbers to Character Strings in Oracle
How To Convert Numbers to Character Strings in Oracle? You can convert numeric values to characters by using the TO_CHAR() function as shown in the following examples: SELECT TO_CHAR(4123.4570) FROM DUAL 123.457 SELECT TO_CHAR(4123.457, '$9,999,999.99') FROM DUAL $4,123.46 SELECT TO_CHAR(-4123.457, ... 2020-03-25, 2389🔥, 0💬

Convert Character Strings to Times in Oracle
How To Convert Character Strings to Times in Oracle? You can convert dates to characters using the TO_CHAR() function as shown in the following examples: SELECT TO_CHAR(TO_DATE('04:49:49', 'HH:MI:SS'), 'DD-MON-YYYY HH24:MI:SS') FROM DUAL; -- Default date is the first day of the current month 01-MAY-... 2019-12-02, 2388🔥, 0💬

Privilege to Insert Rows in Another Schema in Oracle
What Privilege Is Needed for a User to Insert Rows to Tables in Another Schema in Oracle? For a user to insert rows into tables of someone else's schema, he/she needs the INSERT ANY TABLE privilege. The following tutorial exercise gives you a good example of granting "dev" to insert rows in "hr" sch... 2019-06-11, 2385🔥, 0💬

Privilege Needed to Connect to Oracle Server in Oracle
What Privilege Is Needed for a User to Connect to Oracle Server in Oracle? Oracle deny connection to users who has no CREATE SESSION privilege. Try the following tutorial exercise, you will find out how Oracle denies connection: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter SQL&a... 2019-07-09, 2384🔥, 0💬

Add a New Column to an Existing Table in Oracle
How To Add a New Column to an Existing Table in Oracle? If you have an existing table with existing data rows, and want to add a new column to that table, you can use the ALTER TABLE ... ADD statement to do this. Here is an example script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREA... 2019-05-25, 2384🔥, 0💬

Oracle Tablespace - Unit of Logical Storage in Oracle
What Is an Oracle Tablespace in Oracle? An Oracle tablespace is a big unit of logical storage in an Oracle database. It is managed and used by the Oracle server to store structures data objects, like tables and indexes.   ⇒ Oracle Data File - Unit of Physical Storage in Oracle ⇐ Managing Oracle Tab... 2019-04-17, 2384🔥, 0💬

Call a Sub Procedure in Oracle
How To Call a Sub Procedure in Oracle? To call a sub procedure, just use the sub procedure name as a statement. Here is another example of calling a sub procedure: SQL&gt; CREATE OR REPLACE PROCEDURE WELCOME AS 2 PROCEDURE WELCOME_PRINT(S CHAR) AS 3 BEGIN 4 DBMS_OUTPUT.PUT_LINE('Welcome to ' || ... 2018-10-26, 2383🔥, 0💬

File Formats Supported on Export Data in Oracle
How Many File Formats Are Supported to Export Data in Oracle? Oracle SQL Developer can allow to export table data into files in the following formats: TXT - Tab delimited fields file format. CSV - Comma Separated Values (CSV) file format. LOADER - File format used by SQL*Loader. XML - XML file forma... 2019-01-26, 2382🔥, 0💬

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General MySQL Oracle SQL Server