Group items tagged

When it comes to overall performance, it's important to remember that the #1 contributor is always a good database design. The second highest contributor to performance is well-tuned SQL code.

But a better day has come along in MySQL 5.0.37 with the inclusion of the SQL Profiling utility. This interactive diagnostic aid allows a developer or DBA to gain insight into where a set of SQL code spends its time and the resources it is using.

MATCH (patient_1_question.terms) AGAINST ('+$term_1 +$term_2 +$term_3 +$term_4' IN BOOLEAN MODE

The function expects to be given a string containing a US English date format and will try to parse that format into a Unix timestamp

echo strtotime("now"), "\n";echo strtotime("10 September 2000"), "\n";echo strtotime("+1 day"), "\n";echo strtotime("+1 week"), "\n";echo strtotime("+1 week 2 days 4 hours 2 seconds"), "\n";echo strtotime("next Thursday"), "\n";echo strtotime("last Monday"), "\n";

当前week的第一天： select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 1 DAY) 当前week的最后一天： select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) - 5 DAY) 前一week的第一天： select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 8 DAY) 前一week的最后一天： select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 2 DAY) 前两week的第一天： select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 15 DAY) 前两week的最后一天： select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 9 DAY)

当前month的第一天： SELECT concat(date_format(LAST_DAY(now()),'%Y-%m-'),'01') 当前month的最后一天： SELECT LAST_DAY(now()) 前一month的第一天： SELECT concat(date_format(LAST_DAY(now() - interval 1 month),'%Y-%m-'),'01') 前一month的最后一天： SELECT LAST_DAY(now() - interval 1 month) 前两month的第一天： SELECT concat(date_format(LAST_DAY(now() - interval 2 month),'%Y-%m-'),'01') 前两month的最后一天： SELECT LAST_DAY(now() - interval 2 month)

当前quarter的第一天： select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-3 month),'%Y-%m-'),'01') 当前quarter的最后一天： select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-1 month) 前一quarter的第一天： select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-6 month),'%Y-%m-'),'01') 前一quarter的最后一天： select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-4 month) 前两quarter的第一天： select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-9 month),'%Y-%m-'),'01') 前两quarter的最后一天： select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-7 month)