CreateDate INT UNSIGNED NOT NULL DEFAULT UNIX_TIMESTAMP(), Primary Key (Table1ID) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; Navigate:Previous Message•Next Message Options:Reply•Quote Subject Views Written By Posted Create table with default value unix_timestamp ...
mysql>CREATETABLEt1(aINT,bINT);QueryOK,0rowsaffected(0.06sec)mysql>SELECTtable_id,name,instant_colsFROMinformation_schema.innodb_tablesWHEREnameLIKE'%t1%';+---+---+---+|table_id|name|instant_cols|+---+---+---+|1065|test/t1|0|+---+---+---+1rowinset(0.22sec)mysql>SELECTtable_...
When inserting a new row, the default value for a column with an expression default can be inserted either by omitting the column name or by specifying the column asDEFAULT(just as for columns with literal defaults): mysql>CREATETABLEt4(uidBINARY(16)DEFAULT(UUID_TO_BIN(UUID()));mysql>INSER...
列的默认值null 查询不便null 的索引效率不高所以实际中应该避免值为 null,如何避免: 声明列为 not null,并设置默认值 defaultcreate table t10 (id int not null default 0,name char(10) not null default '')主键与自增主键 primary key,能够区分每一行(不重复)create tab 主键 默认值 自增 mysql 创...
declare i intdefault0;setautocommit=0;repeatseti=i+1;insert intoEMPvalues((start+i),rand_string(6),'SALESMAN',0001,curdate(),2000,400,rand_num());until i=max_num end repeat;commit;end $$ delimiter;--雇员表CREATETABLE`EMP`(`empno`int(6)unsigned zerofillNOTNULLCOMMENT'雇员编号',`ename...
CREATE TABLE creates a table with the given name. You must have the CREATE privilege for the table. By default, tables are created in the default database, using the InnoDB storage engine. An error occurs if the table exists, if there is no default database, or if the database does ...
由于该参数首先被设置,所以这部分计算逻辑所取用的变量均来自配置文件中的设置值(源码中的table_cache_size对应配置文件中的table_open_cache),根据计算后得出的limit_1,2,3将取最大值存放在变量request_open_files中。 PS:此处需注意的是,request_open_files和requested_open_files是不同的。
CREATE TABLE creates a table with the given name. You must have theCREATE privilege for the table.By default, tables are created in the default database, using theInnoDB storage engine. An error occurs if the table exists, if there isno default database, or if the database does not ...
MySQL Create Tables: Exercise-10 with Solution 10.Write a MySQL query to create a table named jobs including columns job_id, job_title, min_salary and max_salary, and make sure that, the default value for job_title is blank and min_salary is 8000 and max_salary is NULL will be entere...
创建:create or replace view view_name as 查询语句; with check option ,创建的视图不可修改; oracle 数据库:with read only; 删除:drop view view_name; 记录的插入,修改,删除 插入:insert into table_name[ (column_name,...)] values(value,...);或者可以用select查询子句来插入值; update:update...