Track source dates when loading a data warehouse
A primer on how to reduce network and source system load when reading a relational source into the data warehouse.
2012-07-30
5,420 reads
Magarity Kerns
HASHBYTES can help quickly load a Data Warehouse
Data warehouse loads can be time consuming - this method can be used in some instances to help speed things up.
2010-04-14
16,777 reads
Source system pre-integration analysis
Initial analysis of a new source system can be quite time consuming to manually examine tables and columns to determine which even have worthwhile values in the first place. Running this script against the current database will generate useful information for all the columns of all the tables. Details include data types with varchar lengths, […]
2005-06-07
444 reads
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Question of the Day
STRING_AGG's behavior
Executing the following script (Sql Server 2022), you get the table t0 with 10 rows:
CREATE TABLE t0
( id INT PRIMARY KEY
, field1 VARCHAR(1000)
, field2 VARCHAR(MAX));
INSERT INTO t0
SELECT
gs.value
, REPLICATE ('X', 1000)
, REPLICATE ('Y', 1000)
FROM generate_series(1, 10, 1) gs;
GOWhat happens if you execute the following statements?
select STRING_AGG(field1, ';') within group (order by id) from t0;
select STRING_AGG(field2, ';') within group (order by id) from t0;