mariasql

问题 I'm using a dedicated server with 32GB RAM and an 8-core server, using Maria DB 10.1 and most tables are InnoDB. Total DB size is less than 2GB but I think performance is slow. The following is the my.cnf file I'm using: [mysqld] log-error=/home/MySQL_Server/mysql/dedi.server.co.err datadir=/home/MySQL_Server/mysql pid-file=/home/MySQL_Server/mysqlmysqld.pid innodb_file_per_table=1 skip-name-resolve=1 bind-address=127.0.0.1 #skip-networking=1 #query_cache_type=0 query_cache_type=1 innodb_file

问题 I've been breaking my mind for three days trying to puzzle this one out. I'm new to Maria db and sql in general. I've managed to use UNION on a previous similar situation but it's not working in this one. I have three tables as follows: create table zipcode (zip int, city varchar(30)) create table student (id int, zip_fk int) create table teacher (id int, zip_fk int) I want to create a select query that will have the following fields: city, the number of students from the city, the number of

问题 I've been breaking my mind for three days trying to puzzle this one out. I'm new to Maria db and sql in general. I've managed to use UNION on a previous similar situation but it's not working in this one. I have three tables as follows: create table zipcode (zip int, city varchar(30)) create table student (id int, zip_fk int) create table teacher (id int, zip_fk int) I want to create a select query that will have the following fields: city, the number of students from the city, the number of

问题 I got table like below mysql> select * from dts; +----+------+------+--------+------+------+------+------+------+ | Id | key1 | key2 | serial | pr1 | pr2 | pr3 | pr4 | pr5 | +----+------+------+--------+------+------+------+------+------+ | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 2 | | 2 | 1 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | | 3 | 1 | 1 | 3 | 0 | 0 | 0 | 1 | 0 | | 4 | 1 | 1 | 4 | 1 | 0 | 1 | 1 | 3 | | 5 | 1 | 2 | 5 | 0 | 0 | 0 | 2 | 5 | | 6 | 1 | 2 | 6 | 0 | 0 | 0 | 0 | 1 | | 7 | 1 | 2 | 7 | 0 | 1 | 0 |