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Kimtaro/gist:1437129

Created December 6, 2011 07:01
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Some helpful SQL
Raw
gistfile1.sql
SELECT * FROM table PROCEDURE ANALYSE(0,0)\G
-- "ANALYSE() examines the result from a query and returns an analysis of the results that suggests optimal data types for each column that may help reduce table sizes."
SELECT COUNT(DISTINCT(SUBSTR(column, 1, 22))) / COUNT(DISTINCT(column)) * 100 FROM table;
-- Figures out index coverage with the given index length (22 here).
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