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More and more of our projects are being based on MySQL than SQL Server, mainly due to the software costs associated with Microsoft's solution. Since we often code back and forth between MSSQL and MySQL projects, I decided to put together this handy quick reference chart for commonly used functions.
Main differences between commonly used SQL in Microsoft SQL Server's Transact SQL (MSSQL) and MySQL:
Current Date and Time
MS: SELECT GETDATE()
MY: SELECT NOW()
Optionally: Use CURDATE() for the date only.
Limiting Results
MS: SELECT TOP 10 * FROM table WHERE id = 1
MY: SELECT * FROM table WHERE id = 1 LIMIT 10
Date Field Default Value
MS: DATETIME DEFAULT GETDATE()
MY: DATETIME fields cannot have a default value, i.e. "GETDATE()"
You must use your INSERT statement to specify CURDATE() for the field.
Optionally: Use datatype TIMESTAMP DEFAULT CURRENT_TIMESTAMP
Character Length
MS: LEN()
MY: CHARACTER_LENGTH() Aliases: CHAR_LENGTH(), LENGTH()
Character Replace
MS: REPLACE() works case insensitively
MY: REPLACE() works case sensitively
Trim Functions
MS: LTRIM() and RTRIM()
MY: TRIM()
String Concatenation
MS: CONCATENATION USING + (Does not automatically cast operands to compatible types)
MY: CONCAT(string, string), which accepts two or more arguments.
(Automatically casts values into types which can be concatenated)
Auto Increment Field Definition
MS: tablename_id INT IDENTITY PRIMARY KEY
MY: tablename_id INTEGER AUTO_INCREMENT PRIMARY KEY
Get a List of Tables
MS: SP_TABLES
MY: SHOW TABLES
Get Table Properties
MS: HELP tablename
MY: DESCRIBE tablename
Get Database Version
MS: SELECT @@VERSION
MY: SELECT VERSION()
Recordset Paging
MS: Recordset paging done by client side-ADO (very involved)
MY: Add to end of SQL: "LIMIT " & ((intCurrentPage-1)*intRecsPerPage) & ", " & intRecsPerPage
LIMIT: The first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 (not 1).
Get ID of Newest Inserted Record
MS: SET NOCOUNT ON; INSERT INTO...; SELECT id=@@IDENTITY; SET NOCOUNT OFF;
MY: Two step process:
1. Execute your statement: objConn.Execute("INSERT INTO...")
2. Set objRS = objConn.Execute("SELECT LAST_INSERT_ID() AS ID")
Get a Random Record
MS: SELECT TOP 1 * FROM Users ORDER BY NEWID()
MY: SELECT * FROM Users ORDER BY RAND() LIMIT 1
Generate a Unique GUID
MS: SELECT NEWID()
MY: SELECT UUID()
Other handy links:
MySQL 5.0 Reference Manual
MySQL Miscellaneous Functions
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