General MySQL Oracle SQL Server

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"ALTER TABLE ... DROP COLUMN" - Deleting Existing Columns in SQL Server
How To Delete an Existing Column in a Table with "ALTER TABLE ... DROP COLUMN" in SQL Server? If you have an existing column in a table and you do not need that column any more, you can delete it with "ALTER TABLE ... DROP COLUMN" statement. Here is a tutorial script to delete an existing column: AL... 2016-11-17, 3766🔥, 0💬

CREATE VIEW - Creating a View on an Existing Table in SQL Server
How To Create a View on an Existing Table in SQL Server? If you want to a view on an existing table, you can use the CREATE VIEW statement in a simple syntax: CREATE VIEW view_name AS SELECT ... The tutorial exercise below shows you how to create a view to represent sub set of data stored in fyi_lin... 2016-11-05, 3761🔥, 0💬

What Is a Connect Identifier in Oracle
What Is a Connect Identifier in Oracle? A "connect identifier" is an identification string of a single set of connection information to a specific target database instance on a specific Oracle server. Connect identifiers are defined and stored in a file called tnsnames.ora located in $ORACLE_HOME/ne... 2020-08-13, 3755🔥, 0💬

Creating a View with Data from Multiple Tables in SQL Server
Can You Create a View with Data from Multiple Tables in SQL Server? Can You Create a View with Data from Multiple Tables? The answer is yes. A view can be created with a SELECT statement to join data from multiple tables. It is a common practice to normalize data into multiple tables. Then using a v... 2016-11-05, 3752🔥, 0💬

Counting Duplicated Values in a Column in MySQL
How To Count Duplicated Values in a Column in MySQL? If you have a column with duplicated values, and you want to know what are those duplicated values are and how many duplicates are there for each of those values, you can use the GROUP BY ... HAVING clause as shown in the following example. It ret... 2017-10-16, 3751🔥, 0💬

Privilege to Create Tables in Oracle
What Privilege Is Needed for a User to Create Tables in Oracle? To be able to create tables in a user's own schema, the user needs to have the CREATE TABLE privilege, or the CREATE ANY TABLE privilege, which is more powerful, and allows the user to create tables in other user's schema. The following... 2019-06-29, 3748🔥, 0💬

Assign Query Results to Variables in Oracle
How To Assign Query Results to Variables in Oracle? If you want to assign results from SELECT statements to variables, you can use the INTO clause, which an extension of SELECT statements for PL/SQL. The sample code below shows some good example on INTO clause: DECLARE total NUMBER; now DATE; fname ... 2018-09-24, 3743🔥, 0💬

CHARSET() - Detecting Character Set Name
How to detect the character set name associated to a given character string using the CHARSET() function? CHARSET(str) is a MySQL built-in function that returns the character set name associated to a given character string. A character set name refers to a set of rules to encode a set of characters ... 2025-10-24, 3739🔥, 0💬

Formal Parameters and Actual Parameters in Oracle
What Is the Difference between Formal Parameters and Actual Parameters in Oracle? Formal parameter and actual parameter are two different terms related parameters used in the procedures and functions: A formal parameter is a term used to refer to a parameter defined in the procedure or function decl... 2018-03-18, 3739🔥, 0💬

Overflow Errors on Converting Big Values to NUMERIC in SQL Server
What Happens When Converting Big Values to NUMERIC Data Types in SQL Server Transact-SQL? If you are converting a numeric expression to a NUMERIC data type and the value is too big for the storage size, you will get an arithmetic overflow error as shown in the following examples: -- Overflow error o... 2017-03-22, 3716🔥, 0💬

Running Queries with 'sqlcmd' Tool in SQL Server
How to run Queries with "sqlcmd" tool in SQL Server? "sqlcmd" is a client tool that you can use to interact SQL server. You can follow the tutorial below to run queries on the local SQL Server 2005 Express. 1. Open a command window and enter the following command to start "sqlcmd" and run a simple q... 2016-12-04, 3715🔥, 0💬

Converting Character Strings to Numeric Values in MySQL
How To Convert Character Strings to Numeric Values in MySQL? You can convert character strings to numeric values by using the CAST(string AS DECIMAL) or CAST(string AS SIGNED INTEGER) function as shown in the following examples: SELECT CAST('4123.45700' AS DECIMAL) FROM DUAL; 4123.46 -- Very poor co... 2018-03-28, 3712🔥, 0💬

Differences between BLOB and CLOB in Oracle
What Are the Differences between BLOB and CLOB in Oracle? The main differences between BLOB and CLOB are: BLOB stores values as LOB (Large OBject) in bitstreams. CLOB stores values as LOB (Large OBject) in character steams.   ⇒ ANSI Data Types in Oracle ⇐ Differences between INTERVAL YEAR TO MONTH ... 2020-04-14, 3708🔥, 0💬

Privilege to Create Indexes in Oracle
What Privilege Is Needed for a User to Create Indexes in Oracle? For a user to create indexes, he/she needs the same privilege as the creating tables. Just make sure he/she has the CREATE TABLE privilege. The following tutorial exercise gives you a good example on creating view privilege: &gt;.\... 2019-06-29, 3706🔥, 0💬

"sys.objects" - Listing All Objects in a Given Schema in SQL Server
How To List All Objects in a Given Schema in SQL Server? If you are wonder what objects are stored in a given schema as an object container, you can use view "sys.objects" to get a list of all objects in a schema. The tutorial exercise shows you how to list all objects in schema "fyi" and "dbo": -- ... 2016-10-22, 3705🔥, 0💬

"sp_help" - Getting a List of Columns in a Table in SQL Server
How To Get a List of Columns using the "sp_help" Stored Procedure in SQL Server? Another way to get a list of columns from a table is to use the "sp_help" stored procedure. "sp_help" returns more than just a list of columns. It returns: the table information, the column information, the identity col... 2016-11-17, 3698🔥, 0💬

User Role: Group of Privileges in Oracle
What Is a User Role in Oracle? A user role is a group of privileges. Privileges are assigned to users through user roles. You create new roles, grant privileges to the roles, and then grant roles to users.   ⇒ System Defined User Roles in Oracle ⇐ User Account and Schema: One-to-One Relation in Ora... 2019-07-30, 3697🔥, 0💬

Testing New User Account and Password in MySQL
How To Test a New User Account and Password in MySQL? If you have new user created with a password, you test it using "mysql" program with the "-u" and "-p" options. The following tutorial exercise shows you some interesting use cases of connecting to the server with user names and passwords: &g... 2017-09-08, 3697🔥, 0💬

Verify 10g XE Server Installation in Oracle
How To Check Your Oracle Database 10g XE Installation in Oracle? If you want to check your fresh installation of 10g Express Edition without using any special client programs, you can use a Web browser with this address, http://localhost:8080/apex/. You will see the login page. Enter SYSTEM as the u... 2020-05-05, 3694🔥, 0💬

BREAK of Loop Statement in SQL Server Transact-SQL
How to break a WHILE look statement in SQL Server Transact-SQL? How to use BREAK statements? You can use the BREAK statement to break a WHILE loop inside the statement block in Transact-SQL using this syntax: WHILE condition BEGIN statement_1 statement_2 ... BREAK; statement_n ... END When a BREAK s... 2017-01-11, 3691🔥, 0💬

What Are Logical/Boolean Operations in SQL Server
What Are Logical/Boolean Operations in SQL Server Transact-SQL? Logical (Boolean) operations are performed on Boolean values with logical operators like 'AND', 'OR', or 'NOT'. Logical operations return Boolean values. SQL Server 2005 supports the following logical operations: AND - Returns TRUE if b... 2017-01-11, 3690🔥, 0💬

"sys.columns" - Getting a List of Columns in a Table in SQL Server
How To Get a List of Columns using the "sys.columns" View in SQL Server? If you have an existing table, but you don't remember what are the columns defined in the table, you can use the "sys.columns" system view to get a list of all columns of all tables in the current database. In order to a list o... 2016-11-17, 3686🔥, 0💬

Run PL/SQL Statements in SQL*Plus in Oracle
How To Run PL/SQL Statements in SQL*Plus in Oracle? If you want to run a single PL/SQL statement in SQL*Plus, you need to use the EXECUTE command as shown in the following tutorial example: SQL&gt; SET SERVEROUTPUT ON SQL&gt; EXECUTE DBMS_OUTPUT.PUT_LINE('Welcome to FYIcenter!') Welcome to F... 2020-07-22, 3682🔥, 0💬

Set Up Breakpoints in Debug Mode in Oracle
How To Set Up Breakpoints in Debug Mode in Oracle? To debug a stored procedure, you need to set breakpoints at different statements in the code block, so that execution will be stopped at the statement marked with a breakpoint. When execution is stopped, you can then investigate different variables ... 2018-12-26, 3682🔥, 0💬

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General MySQL Oracle SQL Server