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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, 516👍, 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, 515👍, 0💬

Looping through Query Output Rows in MySQL
How To Query Tables and Loop through the Returning Rows in MySQL? The best way to query tables and loop through the returning rows is to run the SELECT statement with the mysql_query() function, catch the returning object as a result set, and loop through the result with the mysql_fetch_assoc() func...
2017-06-28, 513👍, 0💬

Converting DATETIME and NUMERIC Values in SQL Server
Are DATETIME and NUMERIC Values Convertible in SQL Server Transact-SQL? Are datetime and numeric value convertible? The answer is yes. Here are the main rules on DATATIME and NUMERIC value conversions: During the conversion a DATETIME value will be treated as a NUMERIC value with the number of days ...
2017-02-22, 512👍, 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, 511👍, 0💬

General Questions on Microsoft SQL Server Transact-SQL
Where to find answers to frequently asked questions in general areas of Microsoft SQL Server Transact-SQL? I am new to Transact-SQL. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team in general areas of Microsoft SQL Server Transact-SQL: What Is SQL Langua...
2017-06-16, 510👍, 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, 509👍, 0💬

Locks, Timeouts, and Deadlocks in MySQL
What Are Impacts on Applications from Locks, Timeouts, and DeadLocks in MySQL? If you are using transactions with REPEATABLE READ isolation level and transaction safe storage engines in your applications, data locks, lock timeouts, and dead lock detections will impact your application in a concurren...
2017-07-21, 509👍, 0💬

What Is a Statement in SQL Server Transact-SQL
What is a statement in SQL Server Transact-SQL? A statement in SQL Server Transact-SQL is a single smallest execution unit. Here are some examples of Transact-SQL statements: "PRINT 'Hello World!';" - An output statement that print a character string to the console. "SELECT GETDATE();" - A query sta...
2017-05-29, 509👍, 0💬

Casting Strings to Wrong Code Pages in SQL Server Transact-SQL
What Happens If Strings Are Casted into Wrong Code Pages in SQL Server Transact-SQL? In SQL Server, different collations may use different code pages. For example: Albanian_CI_AI_KS_WS - Albanian, Code page 1250. Arabic_CI_AS_KS_WS - Arabic, Code page 1256. French_CI_AI - French, Code page 1252. Kor...
2017-05-13, 506👍, 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, 506👍, 0💬

Starting mysqld to Support BDB Storage Engine in MySQL
How To Start mysqld to Support the BDB Storage Engine in MySQL? The default "mysqld" program does not support the BDB storage engine. If you want to use the BDB storage engine, you can start MySQL server with the "mysqld-max" program. The tutorial exercise below shows you how to start "mysqld-max" a...
2017-08-13, 505👍, 0💬

Single-Byte Character Data Types in SQL Server Transact-SQL
What are single-byte character string data types supported in SQL Server Transact-SQL? Single-byte character string data types are used to hold single-byte character strings. There are 3 single-byte character string data types supported in SQL Server Transact-SQL: 1. CHAR (or CHARACTER) - Used to ho...
2017-04-08, 505👍, 0💬

Query Multiple Tables Jointly in MySQL
How To Query Multiple Tables Jointly in MySQL? If you want to query information stored in multiple tables, you can use the SELECT statement with a WHERE condition to make an inner join. Assuming that you have 3 tables in a forum system: "users" for user profile, "forums" for forums information, and ...
2017-06-23, 502👍, 0💬

DECLARE Statements in SQL Server Transact-SQL
How to declare a variable in SQL Server Transact-SQL? How to use the DECLARE statements? In Transact-SQL, you must use DECLARE statements to declare variables. Declaring a variable is to define the variable name and the variable data type. In Transact-SQL, you can: Declare a single variable in a sin...
2017-04-04, 502👍, 0💬

Get System Date and Time in SQL Server Transact-SQL
How to get system date and time in SQL Server Transact-SQL? I want a list of functions for getting current system date and time. Here is a comparison of all functions that you can use to get the current date and time from the data base server system: Function Return type Precision ------------------...
2017-02-25, 502👍, 0💬

"@@FETCH_STATUS" - Looping through Result Set in SQL Server
How To Loop through the Result Set with @@FETCH_STATUS in SQL Server Transact-SQL? The FETCH statement only returns one row from the result set. If you want to return all rows, you need to put the FETCH statement in a loop. A simple way to stop the loop to check the system variable @@FETCH_STATUS, w...
2016-10-17, 502👍, 0💬

Exact Numeric Literals in SQL Server Transact-SQL
What are exact numeric literals supported in SQL Server Transact-SQL? Exact numeric literals in Transact-SQL are numbers written in standard signed decimal formats. Exact numeric literals are used to provide values to exact numeric variables or table columns like INTEGER, DECIMAL(8,2), MONEY, etc. E...
2017-05-05, 501👍, 0💬

Attributes of the Implicit Cursor in Oracle
How To Use Attributes of the Implicit Cursor in Oracle? Right after executing a DML statement, you retrieve any attribute of the implicit cursor by using SQL%attribute_name, as shown in the following tutorial exercise: CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name VARCHAR(80) NOT NULL, ...
2018-02-01, 500👍, 0💬

What Is Index in MySQL
What Is Index in MySQL? An index is a single column or multiple columns defined to have values pre-sorted to speed up data retrieval speed.   ⇒Database Basics and Terminologies in MySQL ⇒⇒MySQL Database Tutorials
2017-07-07, 500👍, 0💬

What Is View in MySQL
What Is View in MySQL? A view is a logical table defined by a query statement.   ⇒Database Basics and Terminologies in MySQL ⇒⇒MySQL Database Tutorials
2017-07-07, 500👍, 0💬

Character Strings and Binary Strings in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Character Strings and Binary Strings in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Character Strings and Binary Strings in SQL Server Transact-SQL. Clear answers ...
2017-03-11, 500👍, 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, 498👍, 0💬

Binary String Data Types in SQL Server Transact-SQL
What are binary string data types supported in SQL Server Transact-SQL? Binary string data types are used to hold binary character strings. There are 3 binary string data types supported in SQL Server Transact-SQL: 1. BINARY - Used to hold binary strings of a fixed length, specified in the format of...
2017-04-04, 498👍, 0💬

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