SQL Server 2014 New Features: Hekaton In-Memory Optimization & the Theory of Hash Indexes

Theory: What are Hash Indexes In contrast with conventional disk-based tables, in memory tables possess neither row IDs nor clustering keys to help SQL Server find a row. In-memory tables are therefore required to have at least one index. In this installment we shall look at the details of the hash index. As we shall […]
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SQL Server 2014 New Features: Hekaton In-Memory Optimization

What a Hekaton In-Memory-Optimized Table Is and Is Not By now, most SQL Server jocks and jockesses have heard that the “heka” in “hekaton” is the Greek word for 100 and refers to the potential, if perhaps elusive, 100-fold performance improvement using Hekaton in-memory tables for transaction processing in SQL Server 2014. Whether intended or […]
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Using OPENROWSET to Read Excel Worksheets from SQL Server: Part 2 – How to Define and Query a Linked Server

In my last post we looked at how to set up the system to use OPENROWSET to read Excel Worksheets from SQL Server. I believe that using the OPENROWSET function is the most flexible and practical method for linking Excel worksheets to SQL Server. Before we look at OPENROWSET, however, let’s take a moment to review […]
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Using OPENROWSET to Read Excel Worksheets from SQL Server: Part 1 – How to Set Up the System

Julia P. from the Learning Tree Transact-SQL Programming course writes “I’ve tried to use the OPENROWSET function to query Excel files, but I keep getting the same error. No matter what I try, SQL Server responds with “OLE DB provider “Microsoft.Jet.OLEDB.4.0” for linked server “(null)” returned message “Could not find installable ISAM.”.” Hi, Julia. Unfortunately,lots […]
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How to Use CROSS APPLY with Derived Tables in Transact SQL Queries

Armelle G, a student in Learning Tree’s SQL Server Transact-SQL Programming course asks “Is CROSS APPLY only used with T-SQL Functions?” Great question Armelle! Many SQL Server folks would answer “yes” but the fact is that CROSS APPLY can also be used with subqueries. CROSS APPLY allows you to create the equivalent of correlated derived tables in […]
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