redshift create table example

foreign keys to other database tables, and other tables had foreign keys to it:# tell MySQL to ignore foreign keys in a little whileset foreign_key_checks = 0;# drop my old database Tabledrop table if exists entities;# re-create my tablecreate table entities ( ID int unsigned auto_increment NOT null primary key, project_id int unsigned not NULL, name varchar

column properties and indexes defined in the original table: CREATE TABLE new_tbl like orig_tbl; Create a table with a primary key, a unique index, and a normal index: CREATE TABLE '

Create | skills | performance One important part of the Microsoft development cycle is to adjust the performance of the product. Performance tuning is one of the key components that developers should be mindful of. After years of development, the industry has a lot to learn about how to optimize the performance of WIN32 programs. One of the problems developers now encounter is that it's not clear what causes DTHML and HTML pages to run fast or slow. O

-based, even if committed, the data in the temporary table will also exist-another delete type of temporary table, in transaction units, the table will still exist after the commit, but the data inside the table will be emptied--To avoid confusion, delete the temporary table

are document.body objects in the loop, the benefits will be considerable if they are modified by reference. Subsequently, I cached the Document object----in our test, the Document object was referenced 3,002 times. The modified code is as follows: View the third sample. The run time is only 2100ms, saving about 10% of the time. Using local variables instead of directly referencing the Document object saves an average of 0.4 milliseconds each time. A common way to optimize performance is to

Show variables like 'character_set_client'; #查询字符集show databases; #列出所有的服务器上的数据库alterCreate Database if not existstest; #创建一个数据库Drop DatabaseFK; #删除数据库show tables fromtest; #显示一个数据库中的表 Usetest;Create Tabletb_dept (Idint Primary Keyauto_increment, #部门编号 shaping primary key self-growing Namevarchar( -), #部门名称 descriptionvarchar( -) #描述); Show Tables fromtest;desctb_dept; #查看表信息showCreate Tabletb_dept; Usetest; #员工表