General MySQL Oracle SQL Server

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Accessing MySQL Server through Firewalls in MySQL
How To Access MySQL Servers through Firewalls in MySQL? If your MySQL server is provided by an Internet service company, connecting to the server from your local machine will not be so easy, because there are firewalls between your local machine and your MySQL server as shown below: Firewalls to MyS... 2017-11-25, 3480🔥, 0💬

Passing Expressions to Function Parameters in SQL Server
Can You Pass Expressions to Function Parameters in SQL Server Transact-SQL? Can you pass expressions to stored procedure parameters? The answer is yes. When executing functions, input values can be written as expressions. But the resulting value data type must match the parameter. The tutorial exerc... 2016-12-18, 3480🔥, 0💬

Introduction to SQL Basics in MySQL
Where to find answers to frequently asked questions on Introduction to SQL Basics in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Introduction to SQL Basics in MySQL. Clear answers are provided with tutorial exercises on character and nu... 2018-04-21, 3477🔥, 0💬

Chaning Other User's Password in MySQL
How To Change the Password of Another User Account in MySQL? If you want to change the password of someone else's user account, you can connect to the server as "root" and use the "SET PASSWORD FOR userName ..." command to change the password of another user account. There are two ways to use this c... 2017-09-08, 3475🔥, 0💬

Create a New Table in Oracle
How To Create a New Table 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/fyicenter Connected.... 2020-02-29, 3472🔥, 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, 3472🔥, 0💬

Passing Values to Stored Procedure Parameters in SQL Server
How To Provide Values to Stored Procedure Parameters in SQL Server Transact-SQL? If a stored procedure is created with parameters, you need pass values to those parameters when calling the stored procedure with one of two formats listed below: -- Passing values only EXEC procedure_name value_1, valu... 2016-12-28, 3471🔥, 0💬

VERSION() - Version Number of MySQL Server
How to obtain the version number of the MySQL server using the VERSION() function? VERSION() is a MySQL built-in function that returns the version number of the MySQL server. For example: SELECT VERSION(); -- +-----------+ -- | VERSION() | -- +-----------+ -- | 8.0.17 | -- +-----------+ SELECT @@ver... 2025-01-07, 3469🔥, 0💬

Using ORDER BY with UNION Operators in SQL Server
How To Use ORDER BY with UNION Operators in SQL Server? If you need to sort the output from two queries grouped together with a UNION operator, you need to apply the ORDER BY clause at the group level, not at the subquery level. Note that SQL Server and MySQL react differently to the ORDER BY clause... 2016-10-26, 3469🔥, 0💬

Default Schema of Your Login Session in SQL Server
What Is the Default Schema of Your Login Session in SQL Server? When you login to a SQL Server and select a database to use, SQL Server will assign your login session a default schema. The schema name can be omitted when you refer to objects in the default schema. Here is what you should remember ab... 2016-10-22, 3469🔥, 0💬

Counting Groups Returned with the GROUP BY Clause in Oracle
How To Count Groups Returned with the GROUP BY Clause in Oracle? If you use the COUNT(*) function on groups returned with the GROUP BY clause, it will count the number of rows within each group, not the number of groups. If you want to count the number of groups, you can put the GROUP BY query into ... 2019-09-16, 3468🔥, 0💬

Getting Started with Transact-SQL Statements in SQL Server
Where to find answers to frequently asked questions on Getting Started with Transact-SQL Statements in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Getting Started with Transact-SQL Statements in SQL Server. Clear examples are provi... 2016-12-02, 3468🔥, 0💬

Compilation Error in a Statement Batch in SQL Server
What happens to a Transact-SQL statement batch if there is a compilation error? If a Transact-SQL statement batch has multiple statements, and one of them has compilation error, none of the statements in the batch will be executed. The tutorial exercise below gives you some good examples: SELECT get... 2017-05-29, 3467🔥, 0💬

Restrictions in a READ ONLY Transaction in Oracle
What Are the Restrictions in a READ ONLY Transaction in Oracle? There are lots of restrictions in a READ ONLY transaction: You can not switch to READ WRITE mode. You can not run any INSERT, UPDATE, DELETE statements. You can run SELECT query statements. The tutorial exercise below shows you some of ... 2019-08-19, 3464🔥, 0💬

Understanding SQL DDL Statements for Oracle
Where to find answers to frequently asked questions on SQL DDL Statements for Oracle? I want to start creating tables. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SQL DDL Statements for Oracle. Clear answers are provided with tutorial exercise... 2020-02-29, 3463🔥, 0💬

Define and Use Table Alias Names in Oracle
How To Define and Use Table Alias Names in Oracle? When column names need to be prefixed with table names, you can define table alias name and use them to prefix column names as shown in the following select statement: SQL&gt; SELECT e.first_name, e.last_name, d.department_name FROM employees e ... 2019-10-27, 3460🔥, 0💬

Numeric Expressions and Functions in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Numeric Expressions and Functions in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Numeric Expressions and Functions in SQL Server Transact-SQL. Clear answers are pr... 2017-04-01, 3459🔥, 0💬

Show Execution Statistics Reports in Oracle
How To Get Execution Statistics Reports on Query Statements in Oracle? If your user account has autotrace configured by the DBA, you can use the "SET AUTOTRACE ON STATISTICS" command to turn on execution statistics reports on query statements. The tutorial exercise bellow shows you a good example: S... 2020-05-29, 3458🔥, 0💬

Difference between CHAR and VARCHAR in MySQL
What Are the Differences between CHAR and VARCHAR in MySQL? CHAR and VARCHAR are both ASCII character data types by default. But they have the following major differences: CHAR stores values in fixed lengths. Values are padded with space characters to match the specified length. VARCHAR stores value... 2018-01-19, 3458🔥, 0💬

Delete a User Account in Oracle
How To Delete a User Account in Oracle? If you want to delete a user account and its associated schema, you can log in as SYSTEM and use the DROP USER command as shown in the following example: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; DROP USER DEV CAS... 2019-07-09, 3454🔥, 0💬

Modes of Data Dump Export and Import in Oracle
What Are Data Pump Export and Import Modes in Oracle? Data Pump export and import modes are used to determine the type and portions of database to be exported and imported. Oracle 10g supports 5 export and import modes: Full: Exports and imports a full database. Use the FULL parameter to specify thi... 2016-10-15, 3451🔥, 0💬

Understanding SQL DML Statements for Oracle
Where to find answers to frequently asked questions on SQL DML Statements for Oracle. I want insert and delete data in tables. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SQL DML Statements for Oracle. Clear answers are provided with tutorial ... 2020-02-07, 3450🔥, 0💬

"mysql" Command Line Options in MySQL
What Are the "mysql" Command Line Options in MySQL? "mysql" offers a big list of command line options. Here are some commonly used options: "-?" - Displays a help message on how to use "mysql" and terminates the program. "-u userName" - Specifies a user name for the server to authenticate when conne... 2018-04-28, 3449🔥, 0💬

Show All Indexes in Your Schema in Oracle
How To List All Indexes in Your Schema in Oracle? If you log in with your Oracle account, and you want to get a list of all indexes in your schema, you can get it through the USER_INDEXES view with a SELECT statement, as shown in the following SQL script: SELECT index_name, table_name, uniqueness FR... 2019-05-01, 3447🔥, 0💬

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General MySQL Oracle SQL Server