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mysql> explain select sum(profit) from sales a,company b where a.company_id = b.id and a.year = 2006\G; 
*************************** 1. row *************************** 
id: 1 
select_type: SIMPLE 
table: a 
type: ALL 
possible_keys: NULL 
key: NULL 
key_len: NULL 
ref: NULL 
rows: 12 
Extra: Using where 
*************************** 2. row *************************** 
id: 1 
select_type: SIMPLE 
table: b 
type: ALL 
possible_keys: NULL 
key: NULL 
key_len: NULL 
ref: NULL 
rows: 12 
Extra: Using where 
2 rows in set (0.00 sec) 
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mysql> create index idx_sales_year on sales(year); 
Query OK, 12 rows affected (0.01 sec) 
Records: 12 Duplicates: 0 Warnings: 0
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mysql> explain select sum(profit) from sales a,company b where a.company_id = b.id and a.year = 2006\G; 
*************************** 1. row *************************** 
id: 1 
select_type: SIMPLE 
table: a 
type: ref 
possible_keys: idx_sales_year 
key: idx_sales_


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[MySQLÓÅ»¯] -- ÈçºÎʹÓÃSQL Profiler ÐÔÄÜ·ÖÎöÆ÷
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