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Databases :: MS SQL Server :: is Microsoft SQL-Server standard-compliant ?
By: FiatLink Belgium  Date: 02/11/2004 19:20:38  English  Points: 20 Status: Answered
Quality : Excellent
what are the pitfalls when porting standard SQL 92 ro SQL 99 to an SQL-Server database ?
By: VGR Date: 09/11/2004 10:28:08 English  Type : Answer
well... rather not 8-)

SQL92 standard data formats DATE and TIME are missing (they are in MySql)
TIMESTAMP is not conformant to SQL99 standard (ROWVERSION is neither) (it is in MySql)
SQL92 standard CURRENT_DATE is not supported (it is in MySql)
SQL92 standard CURRENT_TIME is not supported (it is in MySql)
SQL92 standard EXTRACT() is not supported (it is in MySql) - see DatePart()
SQL99 standard TRANSLATE() is not supported
SQL92 standard CAST() is not supported - see the proprietary & diverging CONVERT()
SQL92 standard concatenation operator || is not supported, uses + in stead - MySql uses CONCAT() as || is a binary C-like operator
SQL92 standard SUBSTRING() has a third optional parameter. It is mandatory in SQL-Server while MySql is compliant
SQL92 standard TRIM() is not supported, only LTrim() and RTrim() are - MySql is compliant
SQL92 UNION, INTERSECT and EXCEPT are not supported fully
SQL-Server does not support a schema name in CREATE SCHEMA
SQL-Server does not support CREATE DOMAIN
SQL-Server does not support CREATE ROLE
SQL92 standard JOIN type "NATURAL JOIN" is not supported (MySql is compliant)

More useful to know :
SQL-Server is by default case-insensitive
Defines non-standard type IMAGE and the Access datatypes (MEMO, etc) & functions so be warned against them.
SQL-Server INFORMATION_SCHEMA is like SQL92, not SQL99
SQL-Server supports non-standard SELECT ... INTO <table> ; MySql supports non-standard SELECT ... INTO <filename>
DateDiff() and DateAdd() of SQL-Server are different from Access/VB ones but both are supported !!!
Operator LIKE works only on strings (MySql accepts it on any data type)

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