General MySQL Oracle SQL Server

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What Is Join in MySQL
What Is Join in MySQL? Join is data retrieval operation that combines rows from multiple tables under certain matching conditions to form a single row.   ⇒ What Is Union in MySQL ⇐ What Is View in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-07, 2738🔥, 0💬

What Is CSV in MySQL
What Is CSV in MySQL? CSV (Comma Separated Values) is a file format used to store database table contents, where one table row is stored as one line in the file, and each data field is separated with comma.   ⇒ What Is Transaction in MySQL ⇐ What Is BDB in MySQL ⇑ Database Basics and Terminologies ... 2016-10-16, 2738🔥, 0💬

What Are DDL Statements in Oracle
What Are DDL Statements in Oracle? DDL (Data Definition Language) statements are statements to create and manage data objects in the database. The are 3 primary DDL statements: CREATE - Creating a new database object. ALTER - Altering the definition of an existing data object. DROP - Dropping an exi... 2020-02-29, 2737🔥, 0💬

Connect to Local 10g XE Server in Oracle
How To Connect to a Local Oracle 10g XE Server in Oracle? If you have your Oracle 10g XE server running on your local machine, you can connect your Oracle SQL Developer to the server with the following steps: Start Oracle SQL Developer Right-click on Connections Select New Database Connection Enter ... 2019-02-05, 2737🔥, 0💬

Connect to Local 10g XE Server in Oracle
How To Connect to a Local Oracle 10g XE Server in Oracle? If you have your Oracle 10g XE server running on your local machine, you can connect your Oracle SQL Developer to the server with the following steps: Start Oracle SQL Developer Right-click on Connections Select New Database Connection Enter ... 2019-02-05, 2737🔥, 0💬

Rebuild an Index in Oracle
How To Rebuild an Index in Oracle? If you want to rebuild an index, you can use the "ALTER INDEX ... REBUILD statement as shown in the following SQL script: SELECT index_name, table_name, uniqueness FROM USER_INDEXES WHERE table_name = 'EMPLOYEES'; INDEX_NAME TABLE_NAME UNIQUENES -------------------... 2019-04-17, 2736🔥, 0💬

Revoking User Privileges in MySQL
How To Revoke User Privileges in MySQL? If your want remove some granted user privileges, you can use the "REVOKE privilegeName ..." command. You can only revoke privileges in the same way as they were granted. For example, you can not revoke a privilege on a specific database, if that privilege was... 2017-08-21, 2736🔥, 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, 2733🔥, 0💬

Dividing Query Output into Groups in MySQL
How To Divide Query Output into Groups in MySQL? You can divide query output into multiple groups with the GROUP BY clause. It allows you specify a column as the grouping criteria, so that rows with the same value in that column will be considered as a single group. When the GROUP BY clause is speci... 2017-10-16, 2733🔥, 0💬

Data Pump Export Utility in Oracle
What Is the Data Pump Export Utility in Oracle? Oracle Data Pump Export utility is a standalone programs that allows you to export data objects from Oracle database to operating system files called dump file set, which can be imported back to Oracle database only by Oracle Data Pump Import utility. ... 2016-10-15, 2733🔥, 0💬

ALTER TABLE - Delete a Column in Oracle
How To Delete a Column in an Existing Table in Oracle? If you have an existing column in a table and you need that column any more, you can delete it with ALTER TABLE ... DROP COLUMN statement. Here is an example SQL script: SQL&gt; CREATE TABLE emp_dept_90 2 AS SELECT * FROM employees WHERE dep... 2020-02-20, 2732🔥, 0💬

What Is a Data Lock in Oracle
What Is a Data Lock in Oracle? A data lock is logical flag the Oracle server is placed on data objects to give an exclusive right to a transaction. Statements in other transactions needs to respect data locks based on certain rules. Rules on data locks are: SELECT query statements do not create any ... 2019-08-19, 2731🔥, 0💬

Adding a New DSN with the ODBC Driver for SQL Server
How To Add a New DSN with the ODBC Driver for SQL Server? Assuming that the ODBC driver for SQL Server has been installed as part of the Windows system, the next step of setting up ODBC connection to SQL Server is to create a new DSN (Data Source Name) with the ODBC Data Source Administrator: Go to ... 2024-08-06, 2730🔥, 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, 2730🔥, 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, 2730🔥, 0💬

Date/Time Data Type Comparison in SQL Server Transact-SQL
What are differences between date and time data types in SQL Server Transact-SQL? I want to compare of date and time data types? Here is a comparison table of all date and time data types supported in SQL Server Transact-SQL: Data type Storage size Precision Default Format / (bytes) Value range ----... 2017-02-25, 2730🔥, 0💬

Remove Data Files before Opening a Database in Oracle
How Remove Data Files before Opening a Database in Oracle? Let's say you have a corrupted data file or lost a data file. Oracle can mount the database. But it will not open the database. What you can do is to set the bad data file as offline before opening the database. The tutorial exercise shows y... 2019-04-09, 2729🔥, 0💬

Index Slowing Down INSERT Statements in SQL Server
Does Index Slows Down INSERT Statements in SQL Server? If you want to see the impact of indexes on INSERT statements, you can repeat the same insert script on the table "fyi_links" of the same structure with two indexes: one non-clustered index on column "url" and one non-clustered index on column "... 2016-11-13, 2727🔥, 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, 2726🔥, 0💬

Single-byte String Literals in SQL Server Transact-SQL
What are single-byte string literals supported in SQL Server Transact-SQL? Single-byte string literals in Transact-SQL are sequences of characters enclosed in single quotes. String literals are used to provide values to string variables or table columns like CHAR(40), VARCHAR(40), etc. String litera... 2017-05-20, 2725🔥, 0💬

Show Installed Oracle ODBC Drivers in Oracle
How To Find Out What Oracle ODBC Drivers Are Installed in Oracle? To find out what Oracle ODBC drivers are installed on your Windows system, you can use the ODBC manager to look at them: Go to Control Panel. Go to Administrative Tools. Run Data Sources (ODBC). Go to System DSN tab. Click the Add but... 2016-10-15, 2724🔥, 0💬

What Is a Data Lock in MySQL
What Is a Data Lock in MySQL? MySQL uses two types of data locks at two levels to provide you the transaction isolation level you need: Share Lock at Row Level (S) - A data row is locked by a transaction for reading. Exclusive Lock at Row Level (X) - A data row is locked by a transaction for updatin... 2017-04-28, 2722🔥, 0💬

Passing Name-Value Pairs as Parameters in SQL Server
What Are the Advantages of Passing Name-Value Pairs as Parameters in SQL Server Transact-SQL? When calling a stored procedure defined with parameters, you can pass values to those parameters in two ways: Passing only values in the same order as parameters defined in the stored procedure. Passing nam... 2016-12-28, 2722🔥, 0💬

"CREATE USER" Statements - Creating a User in SQL Server
How to create a user to access a database using "CREATE USER" statements in SQL Server? This is the second tutorial of a quick lesson on creating login and configure users for databases with Transact-SQL statements. Granting a user access to a database involves three steps. First, you create a login... 2016-11-27, 2722🔥, 0💬

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General MySQL Oracle SQL Server