Using functions on indexed columns causes the index not being used. Avoid using functions or use a function-based index to tune the query.
( <index_option> [ , ...n ] ) | [ CHECK ( logical_expression ) ] [ , ...n ] } <index_option> ::= { PAD_INDEX = { ON | OFF } | FILLFACTOR = fillfactor | IGNORE_DUP_KEY = { ON | OFF } | STATISTICS_NORECOMPUTE = { ON | OFF } | ALLOW_ROW_LOCKS = { ON | OFF ...
( <index_option> [ , ...n ] ) | [ CHECK ( logical_expression ) ] [ , ...n ] } <index_option> ::= { PAD_INDEX = { ON | OFF } | FILLFACTOR = fillfactor | IGNORE_DUP_KEY = { ON | OFF } | STATISTICS_NORECOMPUTE = { ON | OFF } | ALLOW_ROW_LOCKS = { ON | OFF ...
The remaining rows are empty and have a status of SQL_ROW_NOROW. After SQLFetch returns, the current row is the first row of the rowset. The rules listed in the following table describe cursor positioning after a call to SQLFetch, based on the conditions listed in the second table in ...
SQLNativeSql returns the SQL string as modified by the driver. SQLNativeSql does not execute the SQL statement. Syntax C++ Copy SQLRETURN SQLNativeSql( SQLHDBC ConnectionHandle, SQLCHAR * InStatementText, SQLINTEGER TextLength1, SQLCHAR * OutStatementText, SQLINTEGER BufferLength, SQLINTEGER ...
SQL SERVER中的用户定义函数(User Defined Functions 简称UDF)分为标量函数(Scalar-Valued Function)和表值函数(Table-Valued Function)。其中表值函数又分为Inline table-valued functions和Multistatement table-valued functions。 用户定义函数(UDF)在 SQL Server 中发挥重要的作用。用户定义函数可以用于执行复杂的逻辑...
SQLRETURN SQLGetInfo( SQLHDBC ConnectionHandle, SQLUSMALLINT InfoType, SQLPOINTER InfoValuePtr, SQLSMALLINT BufferLength, SQLSMALLINT * StringLengthPtr); Arguments ConnectionHandle [Input] Connection handle. InfoType [Input] Type of information. InfoValuePtr [Output] Pointer to a buffer in which...
Usually, we use string data types in SQL Server for text-based data. SQL Server has the following data types for string data: char(n): n defines the character string length from 0 to 8000 characters varchar(n): n defines the character string length from 0 to 8000 characters ...
You can also filter records using the SQL MIN function with the HAVING clause. The HAVING clause is normally used in conjunction with the GROUP BY clause and is used for filtering records based on an aggregate function. For instance, if you want to select only those categories where the mi...
index('%[2,3][0,1,8,9][/]%',@indate),2) RETURN @outdate END *** the error... expression"lipperdbo.convdate(eom) failed. The token "." at line n...