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SQL*Plus Environment Variables in Oracle
What Are SQL*Plus Environment Variables in Oracle? Behaviors of SQL*Plus are also controlled a some environment variables predefined on the local operating system. Here are some commonly used SQL*Plus environment variables: ORACLE_HOME - The home directory where your Oracle client application is ins...
2020-07-22, 2108🔥, 0💬

EXECUTE - Executing Stored Procedures in SQL Server
How To Execute a Stored Procedure in SQL Server Transact-SQL? If you want execute a stored procedure created previously, you can use the EXECUTE statement in the following formats: EXEC procedure_name; EXECUTE procedure_name; The key word EXEC is actually optional. So you can execute a stored proced...
2017-01-05, 2108🔥, 0💬

"sp_rename ... 'COLUMN'" - Renaming an Existing Column in SQL Server
How to rename an existing column with the "sp_rename" stored procedure in SQL Server? If you have an existing column in a table and you want to change the column name, you can use the "sp_rename ... 'COLUMN'" stored procedure. "sp_rename" allows you to change names of COLUMN, DATABASE, INDEX, USERDA...
2016-11-17, 2108🔥, 0💬

Show All Tablespaces in the Current Database in Oracle
How To View Tablespaces in the Current Database in Oracle? If you want to get a list of all tablespaces used in the current database instance, you can use the DBA_TABLESPACES view as shown in the following SQL script example: SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; SELECT TABLESP...
2019-01-20, 2106🔥, 0💬

Sample Databases Are Provided by Microsoft in SQL Server
What Sample Scripts and Sample Databases Are Provided by Microsoft in SQL Server? In order to help you to learn SQL Server, Microsoft provides several free sample scripts and sample databases. SqlServerSamples.msi - 25,469 KB: Sample scripts. AdventureWorksDB.msi - 28,053 KB: Sample OLTP database: A...
2016-12-04, 2106🔥, 0💬

"sp_columns" - Getting a List of Columns in a View in SQL Server
How To Get a List of Columns in a View using the "sp_columns" Stored Procedure in SQL Server? If you have an existing table, but you don't remember what are the columns defined in the view, you can use the "sp_columns" stored procedure to get a list of all columns of the specified view. The followin...
2016-11-05, 2104🔥, 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, 2103🔥, 0💬

sys.sql_modules - Getting Trigger Definitions Back in SQL Server
How To Get the Definition of a Trigger Back in SQL Server? If you want get the definition of an existing trigger back from the SQL Server, you can use the catalog view called sys.sql_modules, which stores definitions of views, stored procedures, and triggers. The sys.sql_modules holds trigger defini...
2016-10-24, 2102🔥, 0💬

Versions of SQL Server Transact-SQL
How do I tell what version of Transact-SQL my SQL Server is using? The Transact-SQL version is the same as the SQL Server. You can determine the SQL Server version using the following Transact-SQL statement: SELECT @@version ------------------------------ ------------------------------ ------------Mi...
2017-06-16, 2100🔥, 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, 2097🔥, 0💬

UPDATE with Subquery Returning No Rows in MySQL
What Happens If the UPDATE Subquery Returns No Rows in MySQL? If you use a subquery to assign new values in the SET clause in an UPDATE statement, and the subquery returns no rows for an outer row, MySQL will provide a NULL value to the SET clause. The tutorial exercise below shows you a good exampl...
2018-01-08, 2094🔥, 0💬

SQL*Plus Commands Stored in a File in Oracle
How Run SQL*Plus Commands That Are Stored in a Local File in Oracle? If you have a group of commands that you need to run them repeatedly every day, you can save those commands in a file (called SQL script file), and using the "@fileName" command to run them in SQL*Plus. If you want to try this, cre...
2020-06-08, 2085🔥, 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, 2085🔥, 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, 2085🔥, 0💬

User Account and Schema: One-to-One Relation in Oracle
What Is the Relation of a User Account and a Schema in Oracle? User accounts and schemas have a one-to-one relation. When you create a user, you are also implicitly creating a schema for that user. A schema is a logical container for the database objects (such as tables, views, triggers, and so on) ...
2019-07-30, 2084🔥, 0💬

Perform a Full Database Export in Oracle
How To Do a Full Database Export in Oracle? If you are ready to do a full database export, you can use the FULL=y parameter on the expdp command, as shown in the following tutorial exercise: &gt;expdp SYSTEM/fyicenter FULL=y ESTIMATE_ONLY=y Starting "SYSTEM"."SYS_EXPORT_FULL_01": SYSTEM/**** FUL...
2016-10-15, 2080🔥, 0💬

Date/Time Operations and Functions in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Date/Time Operations 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 Date/Time Operations and Functions in SQL Server Transact-SQL. Clear answers are ...
2017-02-25, 2078🔥, 0💬

"ALTER INDEX ... REBUILD" - Defragmenting Indexes in SQL Server
How To Rebuild Indexes with ALTER INDEX ... REBUILD in SQL Server? When an index is defragmented to a large percentage, like &gt; 30%, you can use the "ALTER INDEX ... REBUILD" statement to rebuild the index. Here is a tutorial exercise on rebuilding indexes: USE FyiCenterData; GO UPDATE fyi_lin...
2016-11-08, 2078🔥, 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, 2076🔥, 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, 2073🔥, 0💬

What Is a SQL*Loader Control File in Oracle
What Is a SQL*Loader Control File in Oracle? A SQL*Loader control file a text that defines how data files should be loaded into the database. It allows you to specify: Where is the input data file. The format of the input date file. The target table where the data should be loaded. How input data fi...
2016-11-27, 2069🔥, 0💬

How do I call MySQL SP from oracle using HS link ?
How do I call MySQL Stored Procedure from oracle using HS link ? HS link is correct and I can get the tables data just by adding '@' at the end of the table name ,but I can't call the SP same way ! Help please.
2022-01-24, 2063🔥, 0💬

Memory Usage of 10g XE Server in Oracle
How Much Memory Your 10g XE Server Is Using in Oracle? Your 10g XE Server is using about 180MB of memory even there is no users on the server. The server memory usage is displayed on your server home page, if you log in as SYSTEM.   ⇒ Start 10g XE Server from Command Line in Oracle ⇐ Start 10g XE S...
2020-10-10, 2063🔥, 0💬

List All Existing Databases in MySQL
How To Get a List of Databases from MySQL Servers in MySQL? Once you got a MySQL server connection object successfully, you need to know what databases are available on the server and which database you should use to manage your tables and data. To get a list of all available databases on your MySQL...
2017-11-11, 2059🔥, 0💬

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