[MySQL优化案例]系列 -- 带函数的查询条件

mysql>explain select * from tbl_name where date_format(EndTime, '%Y-%m-%d') >= '2007-08-08' AND
date_format(EndTime, '%Y-%m-%d') < '2007-08-09'\G
id: 1
select_type: SIMPLE
table: UserProject
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 1012465
Extra: Using where
mysql>set @dt='2007-08-08' ; set @dt1 = '2007-08-09';
mysql>explain select * from tbl_name where EndTime >= @dt AND EndTime < @dt1\G
id: 1
select_type: SIMPLE
table: UserProject
type: range
possible_keys: EndTime
key: EndTime
key_len: 8
ref: NULL
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