( <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 ...
为什么会有这种情况,这是因为SQL语句里面调用用户定义标量函数(UDF Scalar Function),都是逐行调用用户定义函数,这样需要为每行去提取用户定义函数的定义,然后去执行这些定义,从而导致了性能问题;更深层次的原因是因为函数采用了过程式的处理方法,而SQL Server查询数据则是基于数据集合的,这样在采用过程式的逐行处理时,S...
In general, the pros heavily out weigh any of the cons in this case. The inability to direct path load with a pl/sql based index can easily be overcome by indexing after the load with the parallel query option. The performance of inserts is only marginally affected, most applications won'...
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...
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 ...
Assume that you use Microsoft SQL Server. When you run a query with partition function, SQL Server may generate an Access violation error. Error: 8601 The query processor could not obtain access to a required interface. Status Microsoft ha...
SERVER AUDIT SPECIFICATION SERVER ROLE SERVICE SPATIAL INDEX STATISTICS SYMMETRIC KEY SYNONYM TABLE TABLE (SQL Graph) TABLE IDENTITY (Property) TRIGGER TYPE USER VIEW WORKLOAD GROUP XML INDEX XML INDEX (Selective XML Indexes) XML SCHEMA COLLECTION Collations DROP Permissions Service Broker SET xQuery Do...
The action of the Driver Manager is based on the value of the DriverCompletion argument: SQL_DRIVER_PROMPT: If the connection string does not contain either the DRIVER, DSN, or FILEDSN keyword, the Driver Manager displays the Data Sources dialog box. It constructs a connection string from the...