资讯

Denny's SQL Secrets Troubleshoot Slow-Running Queries In SQL Server Denny breaks down how to identify and fix speed issues in multiple versions of SQL Server. By Denny Cherry 12/11/2013 ...
The ease and ubiquity of SQL have even led the creators of many “ NoSQL ” or non-relational data stores, such as Hadoop, to adopt subsets of SQL or come up with their own SQL-like query languages.
9 best practices for faster SQL queries Retrieve only the columns you need Use CASE instead of UPDATE for conditional column updates Keep large-table queries to a minimum Pre-stage your data ...
SQL Insider Drilling Down on Queries Now that you understand the basic structure of a SQL application, let's dissect the basis of information retrieval: the query. By Anil Desai 02/01/2001 ...
Drilling Down on Queries Now that you understand the basic structure of a SQL application, let's dissect the basis of information retrieval: the query. By Anil Desai 02/01/2001 For many techies, ...
You can use SQL to create, modify, search, and display database information. Dynamic SQL lets you create a query string based off of user input. SQL Server allows you to create dynamic SQL statements.
Any hint of dynamic T-SQL queries should ring warning bells for security minded developers. Dynamic queries are vulnerable to SQL injection attacks, one of the most common database attack vectors.
SQL lets you use one command to quickly create a new table containing a subset of records from a larger table while working in Access. Sound complicated? It's not, as Mary Ann Richardson shows us.