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Get row count of all tables from oracle schema icfun.blogspot.com 18 Mar 2013 | 03:39 pm
It is possible to get the total row count of all tables from a given schema using a single sql. Below one will work. select table_name, to_number( extractvalue( xmltype( dbms_xmlgen.getxml('select co...
Limited SELECT count(*) mysqldiary.com 14 May 2010 | 09:52 am
A SELECT statement with COUNT returns the number of rows retrieved by the SELECT statement (see mysql select count). For performance reasons, the desired result is to limit that count. Including a LIM...
update语句中的子查询表达式导致锁表 shen2.cn 22 Jun 2013 | 12:26 am
mysql的压力已经越来越大了，时不时出现响应迟缓的问题。 查看slow log中有大量对主键进行查询然后更新的语句，rows examined等于1，竟然执行时间超过1秒。语句大概是这样样子的： update table_a set comments = (select count(1) from table_b where id = table_a.id) where id = 123; 看来...
Sudoku Tips: Scanning by Counting sudokutips4u.com 3 Jul 2013 | 02:37 am
The most simple scanning technique is counting – select a row, column or region, and count the numbers in the cells in from 1 to 9, to identify the missing numbers. Of course, this is most helpful wh...
Easy SELECT COUNT(*) with split() openark.org 8 Jun 2013 | 09:41 am
The two conservative ways of getting the number of rows in an InnoDB table are: SELECT COUNT(*) FROM my_table: provides with an accurate number, but makes for a long running transaction which take age...
Easy SELECT COUNT(*) with split() code.openark.org 8 Jun 2013 | 09:41 am
The two conservative ways of getting the number of rows in an InnoDB table are: SELECT COUNT(*) FROM my_table: provides with an accurate number, but makes for a long running transaction which take age...
PHP – Doctrine – DQL – Select Subquery melikedev.com 7 Jun 2013 | 10:37 pm
Whilst working on a recent project I needed the ability to do a subquery look-up as part of a select statement. Basically I needed to count the number of rows, without having to do a group by on the e...
