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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, 754👍, 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, 754👍, 0💬

Dump a Table to a File with "mysqldump" Command in MySQL
How To Dump a Table to a File with "mysqldump" in MySQL? If you want to dump all rows in a table from the server to a file, you can use "mysqldump" with the "-f fileName" option as show in the following tutorial exercise: &gt;cd \mysql\bin &gt;mysqldump -u root -r \temp\links.txt test links ...
2018-05-19, 753👍, 0💬

Open Multiple Cursors at the Same Time in Oracle
Can Multiple Cursors Being Opened at the Same Time in Oracle? Yes, multiple cursors can be opened at the same time. See the following example: CREATE OR REPLACE PROCEDURE FYI_CENTER AS CURSOR emp_cur IS SELECT * FROM employees; emp_rec employees%ROWTYPE; CURSOR dpt_cur IS SELECT * FROM departments; ...
2018-04-07, 753👍, 0💬

Show All Indexes of a given Table in MySQL
How To Get a List of Indexes of a Given Table in MySQL? If you want to see the index you have just created for an existing table, you can use the "SHOW INDEX FROM tableName" command to get a list of all indexes in a given table. The tutorial script below shows you a nice example: mysql&gt; SHOW ...
2018-02-14, 753👍, 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, 752👍, 0💬

Built-in Tablespaces in a Database in Oracle
What Are the Predefined Tablespaces in a Database in Oracle? When you create a new database, Oracle server will create 4 required tablespaces for the new database: SYSTEM Tablespace - Every Oracle database contains a tablespace named SYSTEM, which Oracle creates automatically when the database is cr...
2019-01-20, 752👍, 0💬

Shutdown the Server with "mysqladmin" Command in MySQL
How To Shut Down the Server with "mysqladmin" in MySQL? If you want to shut down the server with "mysqladmin", you can use the command "mysqladmin shutdown" as shown in the following tutorial example: &gt;cd \mysql\bin &gt;mysqladmin -u root shutdown If this command returns no messages, your...
2018-06-01, 752👍, 0💬

"DROP USER" - Deleting a Database User in SQL Server
How To Delete an Existing Database User in SQL Server? If you don't want to keep a database user any more, you should delete the user by using the "DROP USER" statement. This tutorial exercise shows how to delete "Dba_User": -- Login with "sa" USE FyiCenterData; GO DROP USER Dba_User; GO -- List all...
2017-08-25, 752👍, 0💬

Giving Privileges at Server Level in MySQL
How To Grant User Privileges at the Global Level in MySQL? If you want to grant a user privilege at the global level, you can use the "GRANT privilegeName ON *.* TO userName" command. The argument "*.*" in the command stands for all database and all tables. The following tutorial exercise shows you ...
2017-08-21, 752👍, 0💬

Out-of-Range DATETIME Values in SQL Server Transact-SQL
What Are Out-of-Range Errors with DATETIME values in SQL Server Transact-SQL? When you enter DATETIME values, you may get out-of-range errors due to two common mistakes: The date value is a valid calendar date, but it is not in the range covered by DATETIME data type: from January 1, 1753, to Decemb...
2017-04-08, 752👍, 0💬

DEFAULT - Providing Default Values to Function Parameters in SQL Server
How To Provide Default Values to Function Parameters in SQL Server Transact-SQL? If you add a parameter when creating a stored procedure, you can provide a default value so that the execution statement is not required to pass input value to this parameter: To define a default value to a parameter wh...
2016-12-18, 752👍, 0💬

Omitting Columns in INSERT Statements in MySQL
How To Omit Columns with Default Values in INSERT Statement in MySQL? 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 column...
2018-01-16, 751👍, 0💬

Delete Multiple Rows from a Table in Oracle
How To Delete Multiple Rows from a Table in Oracle? You can delete multiple rows from a table in the same way as deleting a single row, except that the WHERE clause will match multiple rows. The tutorial exercise below deletes 3 rows from the fyi_links table: SELECT * FROM fyi_links WHERE id &gt...
2020-01-04, 750👍, 0💬

Run SQL Statements with SQL Developer in Oracle
How To Run SQL Statements with Oracle SQL Developer in Oracle? Once a connection is established with an Oracle server, you can enter any SQL statements in the SQL Statement area. Try yourself with the following steps: Go to the SQL Statement area Enter SELECT username, default_tablespace FROM USER_U...
2018-10-08, 750👍, 0💬

Show Server Status with "mysqladmin" in MySQL
How To Check Server Status with "mysqladmin" in MySQL? If you want to check the server status by with "mysqladmin", you can following this tutorial example: &gt;cd \mysql\bin &gt;mysqladmin -u root status Uptime: 223 Threads: 1 Questions: 1 Slow queries: 0 Opens: 12 Flush tables: 1 Open tabl...
2018-06-01, 750👍, 0💬

Tables Using InnoDB Storage Engine in MySQL
How To Create a New Table Using the InnoDB Storage Engine in MySQL? InnoDB storage engine was developed by Innobase Oy, which is an Oracle company now. InnoDB is transaction safe, and has been used by a number of large Websites, like Slashdot.org. InnoDB is not the default storage engine. You need t...
2017-09-01, 750👍, 0💬

Quoting Date and Time Values in MySQL
How To Quote Date and Time Values in SQL Statements in MySQL? If you want to provide date and time values in a SQL statement, you should write them in the format of "yyyy-mm-dd hh:mm:ss", and quoted with single quotes ('). The tutorial exercise below shows you two INSERT statements. The first one us...
2017-06-23, 750👍, 0💬

"ALTER INDEX ... REORGANIZE" - Defragmenting Indexes in SQL Server
How To Defragment Indexes with ALTER INDEX ... REORGANIZE in SQL Server? When an index is defragmented to a small percentage, like &lt; 30%, you can use the "ALTER INDEX ... REORGANIZE" statement to defragment the index. Here is a tutorial exercise on defragmenting indexes: USE FyiCenterData; GO...
2016-11-08, 750👍, 0💬

Query with a Left Outer Join in Oracle
How To Write a Query with a Left Outer Join in Oracle? If you want to query from two tables with a left outer join, you can use the LEFT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a left outer join from two tables: departments and employees. The join conditi...
2019-10-18, 749👍, 0💬

What Is NULL in PL/SQL in Oracle
What Is NULL in PL/SQL in Oracle? NULL is a reserved key word and it stands for two things in PL/SQL: NULL is an executable statement, and means doing nothing. NULL is a data value, and means no value. The following sample script shows you examples of using NULL keyword: DECLARE next_task CHAR(80); ...
2018-07-13, 749👍, 0💬

Assigning NULL Values to Variables or Columns in SQL Server
How To Assign NULL Values to Variables or Columns in SQL Server Transact-SQL? The rule for assigning NULL values to variables or table columns is simple: Use keyword "NULL" directly as normal values. "NULL" can be used in SET statements to assign NULL values to variables. "NULL" can be used in SET c...
2017-02-05, 749👍, 0💬

Converting Binary Strings into Character Strings in SQL Server
Can Binary Strings Be Converted into Character Strings in SQL Server Transact-SQL? Binary strings and character strings are convertible. But there are several rules you need to remember: Binary strings can be converted implicitly to character strings by assignment operations. Binary strings can not ...
2017-02-28, 748👍, 0💬

Load Data from External Tables in Oracle
How To Load Data from External Tables to Regular Tables in Oracle? Once you have your data entered in a text file, and an external table defined to this text file, you can easily load data from this text file to a regular table. The following tutorial exercise shows you how to load data from the tex...
2016-10-15, 748👍, 0💬

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