PERCENTILE_DISC selects from the supplied observations. Preserve duplicates and distinguish an observed threshold from an interpolated value.
Data Mining: A Simple Introduction and a SQL Basket Example
Market-basket analysis turns purchases into measurable product relationships. Deduplicate products within each order, calculate support, confidence and lift in T-SQL, and interpret the counts before drawing conclusions from a small sample.
SQL SERVER – Mirrored Backup and Restore and Split File Backup – Introduction
Backup and Restore lessons from my consulting work: conventional backups, split file backups, mirrored backups and the FORMAT clause, each with an example.
DATEADD Nanoseconds: Round to datetime2 Ticks
DATEADD nanoseconds do not provide single-nanosecond storage. Test rounding thresholds with an explicit datetime2(7) input.
SQLAuthority News – Baby SQLAuthority is here!
Baby SQLAuthority is here! God has blessed Nupur and me with a healthy baby girl on September 1, 2009. Do you have a suggestion for an Indian name?
Oracle to SQL Server: Translating NVL, ROWNUM and Sequences
Translate Oracle to SQL Server expressions for NULLs, row limits, dates, sequences and concatenation, and test where they differ.
Central Management Servers and Registered Servers
Use Central Management Servers and registered servers in SSMS to organize SQL Server instances and run safe read-only queries across groups.
Finding Single-Use Plans Wasting Memory in the Cache
Find single-use plans, compare their cache memory with the total, and inspect parameterization before discussing server-wide cache settings.
REGEXP_MATCHES: Read Matches and Capture Groups
REGEXP_MATCHES returns full matches and captured groups. Read group values and positions, preserve duplicate letters, and check a no-match input.
LIKE ESCAPE: Search for a Literal Percent Sign
LIKE ESCAPE expresses a literal punctuation search. Preserve the distinction between wildcard pattern instructions and stored text.