DDL: 数据定义语言 Data Definition LanguageDCL: 数据控制语言 Data Control LanguageDML: 数据操作语言 Data Manipulate LanguageDQL: 数据查询语言 Data Query Language 1.DDL: 数据定义语言 (create、drop) 1.create针对库的操作 1.语法 mysql> help create databaseName: 'CREATE DATABASE'Description:Syntax:CREA...
id int, name varchar, #ERROR 1064 (42000): You have an error in your SQL syntax; birthday date, gender char, weight double(4,1), #-999.9~999.9 score int ); create table stu( id int, name varchar(20), birthday date, gender char, weight double(4,1), #-999.9~999.9 score int );...
mysql> insert into emp values('lisa','2003-02-01','3000',2); 技巧:对于含可空字段、非空但是含有默认值的字段、自增字段,可以不用在 insert 后的字段列表里面出现,values 后面只写对应字段名称的 value,这些没写的字段可以自动设置为 NULL、默认值、自增的下一个数字,这样在某些情况下可以大大缩短 SQ...
GRANT Syntax MySQL用户授权(GRANT) 对于新建的MySQL用户,必须给它授权,可以用GRANT语句来实现对新建用户的授权。 语法格式 GRANT priv_type[(column_list)] [,priv_type[(column_list)]]... ON[object_type]priv_level TO user[auth_option][,user[auth_option]]... [REQUIRE{NONE|tls_option[[AND]tls_...
Syntax:TRUNCATE TABLE table_name; Example:TRUNCATE TABLE Employee; The above command will delete the data from the ‘Employee’ table but not the table. 2. Data Manipulation Language: The SQL commands that deal with manipulating data in a database are classified as DML (Data Manipulation Languag...
CREATE Command in SQL SQL Create the database or its object (ie table, index, view, function, etc.). Syntax CREATE DATABASE databasename Example CREATE DATABASE Student_data; SQL Copy Syntax CREATE TABLE table_name ( column1 datatype, column2 datatype, column3 datatype, ... ); Examp...
GaussDB allows users to set rights for objects that will be created in the future. For details, see ALTER DEFAULT PRIVILEGES. Changing Owners GaussDB provides statements for changing owners of database objects. For details, see REASSIGN OWNED. Parent topic: SQL Syntax Copyright © 2024 Huawei ...
Syntax: TRUNCATE TABLE table_name; Example:Deletes all the rows from the tableEmployees. TRUNCATE TABLE EMPLOYEES; 2. DML (Data Manipulation Language) SQL commands that deals with the manipulation of data comes under DML category. The popular commands that come under DML are: ...
Syntax for DCLGEN DCLGENTABLE(table-nameview-name)OWNER( owner-name)AT( location-name)LIBRARY( library name( member-name)/ password)ACTION(ADDREPLACE)LANGUAGE(PLICIBMCOBCPP)NAMES( prefix)STRUCTURE( structure-name)APOSTQUOTELABEL(NOYES)DBCSSYMBOL(GN)DBCSDELIM(YESNO)COLSUFFIX(NOYES...
Syntax for DCLGEN DCLGENTABLE(table-nameview-name)OWNER( owner-name)AT( location-name)LIBRARY( library name( member-name)/ password)ACTION(ADDREPLACE)LANGUAGE(PLICIBMCOBCPP)NAMES( prefix)STRUCTURE( structure-name)APOSTQUOTELABEL(NOYES)DBCSSYMBOL(GN)DBCSDELIM(YESNO)COLSUFFIX(NOYES...