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How To Enter Numeric Values as HEX Numbers
How To Enter Numeric Values as HEX Numbers? - MySQL FAQs - Introduction to SQL Basics If you want to enter numeric values as HEX numbers, you can quote HEX numbers with single quotes and a prefix of (X), or just prefix HEX numbers with (0x). A HEX number string will be automatically converted into a...
2007-05-11, 8838👍, 0💬

How To Rename an Existing Column in a Table
How To Rename an Existing Column in a Table? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you have an existing column in a table and you want to change the column name, you can use the "ALTER TABLE ... CHANGE" statement. This statement allows you to change the name of a colu...
2007-05-11, 4421👍, 0💬

How To Get a List of All Tables in a Database
How To Get a List of All Tables in a Database? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you want to see the table you have just created, you can use the "SHOW TABLES" command to get a list of all tables in database. The tutorial script gives you a good example: mysql> SH...
2007-05-11, 4470👍, 0💬

How To Enter Boolean Values in SQL Statements
How To Enter Boolean Values in SQL Statements? - MySQL FAQs - Introduction to SQL Basics If you want to enter Boolean values in SQL statements, you use (TRUE), (FALSE), (true), or (false). Here are some good examples: SELECT TRUE, true, FALSE, false FROM DUAL; +------+------+-------+------- +| TRUE ...
2007-05-11, 8657👍, 0💬

How To Create a Testing Table
How To Create a Testing Table? - MySQL FAQs - Understanding SQL INSERT, UPDATE and DELETE Statements If you want to practice DML statements, like INSERT, UPDATE and DELETE, you should create a testing table. The tutorial exercise shows you a good example: mysql> CREATE TABLE fyi_links (id INTEGER PR...
2007-05-11, 4404👍, 0💬

How To Drop an Existing Index
How To Drop an Existing Index? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you don't need an existing index any more, you should delete it with the "DROP INDEX indexName ON tableName" statement. Here is an example SQL script: mysql> DROP INDEX tip_subject ON tip; Query OK, ...
2007-05-11, 4576👍, 0💬

How To Drop an Existing Table
How To Drop an Existing Table? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you want to delete an existing table and its data rows, you can use the "DROP TABLE" statement as shown in the tutorial script below: mysql> SELECT * FROM tipBackup; +----+-------------+---------- ---...
2007-05-11, 4448👍, 0💬

How To Drop an Existing View
How To Drop an Existing View? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you have an existing view, and you don't want it anymore, you can delete it by using the "DROP VIEW viewName" statement as shown in the following script: mysql> DROP VIEW faqComment; Query OK, 0 rows ...
2007-05-11, 4571👍, 0💬

How To Create a Table Index
How To Create a Table Index? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you have a table with a lots of rows, and you know that one of the columns will be used often as a search criteria, you can add an index for that column to improve the search performance. To add an ind...
2007-05-11, 4578👍, 0💬

How To Use LIKE Conditions
How To Use LIKE Conditions? - MySQL FAQs - Introduction to SQL Basics A LIKE condition is also called pattern patch. There are 3 main rules on using LIKE condition: '_' is used in the pattern to match any one character. '%' is used in the pattern to match any zero or more characters. ESCAPE clause i...
2007-05-11, 4462👍, 0💬

How To Use CASE Expression
How To Use CASE Expression? - MySQL FAQs - Introduction to SQL Basics There are 2 ways to use the CASE expression. The first way is to return one of the predefined values based on the comparison of a given value to a list of target values. The second way is to return one of the predefined values bas...
2007-05-11, 4474👍, 0💬

How To Create a New Table
How To Create a New Table? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements If you want to create a new table, you can use the "CREATE TABLE" statement. The following tutorial script shows you how to create a table called "tip": mysql> CREATE TABLE tip (id INTEGER PRIMARY KEY, subj...
2007-05-11, 4454👍, 0💬

How To Create a New View
How To Create a New View? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements You can create a new view based on one or more existing tables by using the "CREATE VIEW viewName AS selectStatement" statement as shown in the following script: mysql> CREATE TABLE comment (faqID INTEGER, m...
2007-05-11, 4677👍, 0💬

How To Use IN Conditions
How To Use IN Conditions? - MySQL FAQs - Introduction to SQL Basics An IN condition is single value again a list of values. It returns TRUE, if the specified value is in the list. Otherwise, it returns FALSE. Some examples are given in the tutorial exercise below: SELECT 3 IN (1,2,3,4,5) FROM DUAL; ...
2007-05-11, 4391👍, 0💬

What Are DDL Statements
What Are DDL Statements? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements 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 defi...
2007-05-11, 4453👍, 0💬

What Are DML Statements
What Are DML Statements? - MySQL FAQs - Understanding SQL INSERT, UPDATE and DELETE Statements DML (Data Manipulation Language) statements are statements to change data values in database tables. The are 3 primary DML statements: INSERT - Inserting new rows into database tables. UPDATE - Updating ex...
2007-05-11, 4549👍, 0💬

What Are NULL Values
What Are NULL Values? - MySQL FAQs - Introduction to SQL Basics NULL is a special value that represents no value. Here are basic rules about NULL values: NULL presents no value. NULL is not the same as an empty string ''. NULL is not the same as a zero value 0. NULL can be used as any data type. NUL...
2007-05-11, 4685👍, 0💬

What Are the Differences between BINARY and VARBINARY
What Are the Differences between BINARY and VARBINARY? - MySQL FAQs - Introduction to SQL Basics Both BINARY and VARBINARY are both binary byte data types. But they have the following major differences: BINARY stores values in fixed lengths. Values are padded with 0x00. VARBINARY stores values in va...
2007-05-11, 4624👍, 0💬

What Are the Differences between CHAR and VARCHAR
What Are the Differences between CHAR and VARCHAR? - MySQL FAQs - Introduction to SQL Basics 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 speci...
2007-05-11, 4656👍, 0💬

What Are the Differences between CHAR and NCHAR
What Are the Differences between CHAR and NCHAR? - MySQL FAQs - Introduction to SQL Basics Both CHAR and NCHAR are fixed length string data types. But they have the following differences: CHAR's full name is CHARACTER. NCHAR's full name is NATIONAL CHARACTER. By default, CHAR uses ASCII character se...
2007-05-11, 4637👍, 0💬

How To Include Comments in SQL Statements
How To Include Comments in SQL Statements? - MySQL FAQs - Introduction to SQL Basics If you want to include comments in a SQL statement, you can first enter "--", then enter your comment until the end of the line. The tutorial exercise below shows you some good examples: SELECT 'Hello world!' FROM D...
2007-05-11, 4639👍, 0💬

What Are Numeric Data Types
What Are Numeric Data Types? - MySQL FAQs - Introduction to SQL Basics MySQL supports the following numeric data types: BIT(n) - An integer with n bits. BOOL same as BOOLEAN - Boolean values stored in 1 bit. TINYINT - A small integer stored in 1 byte. SMALLINT - A small integer stored in 2 bytes. ME...
2007-05-11, 4702👍, 0💬

What Are String Data Types
What Are String Data Types? - MySQL FAQs - Introduction to SQL Basics MySQL supports the following string data types: CHAR(n) same as CHARACTER(n) - Fixed width and " " padded characters strings. Default character set is ASCII. NCHAR(n) same as NATIONAL CHARACTER(n) - Fixed width and " " padded char...
2007-05-11, 4504👍, 0💬

What Are Date and Time Data Types
What Are Date and Time Data Types? - MySQL FAQs - Introduction to SQL Basics MySQL supports the following date and time data types: DATE - A date in the range of '1000-01-01' and '9999-12-31'. Default DATE format is "YYYY-MM-DD". DATETIME - A date with the time of day in the range of '1000-01-01 00:...
2007-05-11, 4561👍, 0💬

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