Query Cache SELECT Options

SELECT SQL_CACHE id, name FROM customer;
SELECT SQL_NO_CACHE id, name FROM customer;

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Enable the query cache in MySQL to Improve Performance

To see the cache size: 

mysql> SHOW VARIABLES LIKE 'query_cache_size';  

To manage the cache size:

mysql> SET GLOBAL query_cache_size = 16777216;

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MS SQL SERVER - String Comparison

Sometimes, comparing 2 strings can be a bit tricky in MS SQL Server. For example, if there is a field of name as varchar(n), containing the value of "Microsoft", it is actually treated as "Microsoft        " (fill the rest of field with spaces). Therefore using = always return wrong answer. Using LIKE however, return those strings which contains word Microsoft which is not the desired answer. The solution is to use PATTERN MATCHING as follow:

SELECT "Microsoft        " = "Microsoft[ ]%"

[ ]% represents the spaces