create database语句是在MySQL实例上创建一个指定名的数据库,create schema语句的语义和create database是一样的。先来看下create的语法: Syntax:CREATE{DATABASE|SCHEMA} [IFNOTEXISTS] db_name [create_specification] ... create_specification: [DEFAULT]CHARACTERSET[=] charset_name|[DEFAULT]COLLATE[=] collati...
Syntax:CREATE[TEMPORARY]TABLE[IF NOT EXISTS]tbl_name (create_definition,...)[table_options][partition_options]CREATE[TEMPORARY]TABLE[IF NOT EXISTS]tbl_name[(create_definition,...)][table_options][partition_options][IGNORE | REPLACE][AS]query_expressionCREATE[TEMPORARY]TABLE[IF NOT EXISTS]tbl_na...
ThePRIMARY KEYclause follows thelicense_platedata type definition. When dealing with primary keys based on single columns, you can use the simplified syntax to create the key, writingPRIMARY KEYin the column definition. If the following output prints, the table has been created: Output Query OK,...
SQLPrimaryKeys返回构成表的主键的列名称。 驱动程序将信息作为结果集返回。 此函数不支持在单个调用中从多个表返回主键。 语法 C++复制 SQLRETURNSQLPrimaryKeys( SQLHSTMT StatementHandle, SQLCHAR * CatalogName, SQLSMALLINT NameLength1, SQLCHAR * SchemaName, SQLSMALLINT NameLength2, SQLCHAR * TableName,...
SQL CREATE OR REPLACE VIEW Syntax CREATE OR REPLACE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition 现在,我们希望向 “Current Product List” 视图添加 “Category” 列。我们将通过下列 SQL 更新视图: CREATE VIEW [Current Product List] AS ...
syntax 複製 WHERE Table1.Field1=Table2.Field1 AND Table2.Field2=Table3.Field1 AND Table3.Field2=Table1.Field2. 屬於主鍵 (資料表) 的資料行必須先依優先順序定義,後面接著任何非主鍵資料行。 永續性資料行必須在暫存資料行之前定義。 未定義文字資料行的排序次序;不過,相同的文字值一律會群組在一...
Mysql(版本8.0.25)不支持full join,执行报错【1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'full join 】 insert into--向表中插入新的行
SQL CREATE OR REPLACE VIEW Syntax CREATE OR REPLACE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE 1. 2. 3. 4. 5. SQL 撤销视图 SQL DROP VIEW Syntax DROP VIEW 1. 2. SQL Date 提示:如果您希望使查询简单且更易维护,那么请不要在日期中使用时间部分!
syntaxsql 複製 CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column_name [ ASC | DESC ] [ ,...n ] ) [ WITH <backward_compatible_index_option> [ ,...n ] ] [ ON { filegroup_name | "default" } ] ::= { [ database_name. [ owner_name ] . ...
The basic syntax for aforeign key constraint is: CONSTRAINTconstraint_nameFOREIGNKEY(column_name)REFERENCES[ schema_name.] referenced_table_name [ ( ref_column ) ] Examples: 1.1:Creating aTable with aPrimary Key In this recipe, I’ll create atable with asingle column primary key: ...