Creates a table using the specified fields or from an array.Copy CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] [CODEPAGE = nCodePage] ( FieldName1 FieldType [( nFieldWidth [, nPrecision] )] [NULL | NOT NULL] [CHECK lExpression1 [ERROR cMessageText1]] [AUTOINC [NEXT...
CREATE TABLE - SQL Command Article 11/14/2006 Creates a table using the specified fields or from an array. Copy CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] ( FieldName1 FieldType [( nFieldWidth [, nPrecision] )] [NULL | NOT NULL] [CHECK lExpression1 [ERROR cMessageTe...
Here, the SQL command checks if a table namedCompaniesexists, and if not, it creates a table with specified columns. Create Table Using Another Existing Table In SQL, we can create a new table by duplicating an existing table's structure. Let's look at an example. -- create a backup t...
TheCREATE TABLEcommand creates a new table in the database. The following SQL creates a table called "Persons" that contains five columns: PersonID, LastName, FirstName, Address, and City: Example CREATETABLEPersons ( PersonID int, LastName varchar(255), ...
Creates a table having the specified fields.The Visual FoxPro ODBC Driver supports the native Visual FoxPro language syntax for this command. For driver-specific information, see Driver Remarks.SyntaxCopy CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] (FieldName1FieldType [(n...
( Using Command Lines ) If you prefer you can also run commands from a command line to create a table. A lot of web hosts don't give you shell access to the server anymore, or allow remote access to the MySQL servers. If you want to do it this way you may have to install MySQL...
候選索引(在 CREATE TABLE 或 ALTER TABLE - SQL 中包含 UNIQUE 選項所建立的索引,與 INDEX 命令中的 UNIQUE 選項所建立的索引不同。 在 INDEX 命令中使用 UNIQUE 選項建立的索引允許重複索引鍵;候選索引不允許重複的索引鍵。 如需 UNIQUE 選項的其他資訊,請參閱 INDEX。 在用於主要或候選索引的欄位中,不允許...
Now if we want to create a table called laboratory with two foreign keys and a primary key constraint, also using check constraint to check amount entered should be greater than 0, how we execute it with SQL create table statement:
【参考资料】 https:///postgresql/create-table.htmlPostgreSQL 创建表 CREATE TABLE https://www.alibabacloud.com/help/zh/doc-detail/52951.htmPostgreSQL UPSERT的功能与用法 https:///postgresql-unnest-batch-crud-merge/PostgreSQL 批量插入, 更新和合并操作...
command.Connection=newSqlConnection(connStr);//第三步:创建SqlDataAdapterSqlDataAdapter adapter =newSqlDataAdapter(command);//第四步:创建DataSet和DataTableDataSet dataSet =newDataSet(); DataTable dataTable=newDataTable();//第五步:填充数据adapter.Fill(dataTable); ...