標籤:分頁程式一般由兩條SQL組成:SELECT COUNT(*) FROM ... WHERE ....SELECT ... FROM ... WHERE LIMIT ... 如果使用SQL_CALC_FOUND_ROWS的話,一條SQL就可以了:SELECT SQL_CALC_FOUND_ROWS ... FROM ... WHERE LIMIT ... 在得到資料後,通過FOUND_ROWS()可以得到不帶LIMIT的結果數:SELECT
標籤:I was always wondering what the size of numeric columns in MySQL was. Forgive me if this is obvious to someone else. But for me the MySQL manual lacks a great deal in this field.TL;DR: It‘s about the display width. You only see it when you use
標籤:項目是基於:thinkcmf的,新的需求是對各欄目的文章數量進行統計SQl很簡單,先根據分類ID進行分組,然後再通過CASE WHEN 再統計不同文章狀態數量SELECT t.name,t.parent,t.term_id,count(1) as count ,COUNT( CASE WHEN p.post_status = 1 then 1 else null end ) as p1 # 1=已審核,COUNT( CASE WHEN p.post_status = 0
標籤:1.登入mysql -uroot -hlocalhost -pEnter password: ***2.查看所有庫,使用對應庫,建立庫show databases;use sys;create database dataBase;3.查看錶show tables;4.建立表create table student( id int primary key auto_increment, name varchar(20) not null, age int default 1
標籤:1,剛開始我使用的是Navicat for MySQL工具串連遠端mysql的資料庫。報錯了。報錯資訊是 Error 1130: Host ‘192.168.1.80‘ is not allowed to connect to this MySQL server。我查詢網上的解決方案共有兩種:a.
標籤:mysql查看MySQL運行進程mysql>show processlist;查看Innodb引擎運行情況:mysql>show engine innodb status\G查看MySQL參數情況:mysql>show [global] variables like ‘%innodb%‘;查看MySQL運行狀態:mysql>show [global] status like ‘%thread%‘;查看錶、預存程序、觸發器:mysql>show