using(DbCommand cmd=...)using(var reader=cmd.ExecuteReader()) { var schema=reader.GetSchemaTable(); foreach(DataRowrowinschema.Rows) { Debug.WriteLine(row["ColumnName"]+" - "+row["DataTypeName"]) } } Seethis articlefor further details. 回答2 In SQL Server, you can use this query: ...
A. MODIFYTABLE B. MODIFYSTRUCTURE C. ALTERTABLE D. ALTERSTRUCTURE 相关知识点: 试题来源: 解析 C 正确答案:C 解析:在Visual FoxPro中,修改表的结构有两个命令ALTER TABLE:用SQL命令修改表的结构; MODIFY STRUCTURE:在表设计器中修改表的结构;题目要求是SQL语句中修改表结构的命令,所以命令是ALTERTABLE。反馈...
If type_schema_name isn't specified, the SQL Server Database Engine references type_name in the following order: The SQL Server system data type. The default schema of the current user in the current database. The dbo schema in the current database. For memory-optimized tables, see Support...
COPY STRUCTURE Command COPY STRUCTURE EXTENDED Command COPY TAG Command COPY TO ARRAY Command COPY TO Command COUNT Command CREATE CLASS Command CREATE CLASSLIB Command CREATE COLOR SET Command CREATE Command CREATE CONNECTION Command CREATE CURSOR - SQL Command CREATE DATABASE Command CREATE FORM Comman...
In PostgreSQL, the “\d” command, the “\d+” command, “information_schema”, and the “SELECT *” statements with the “FALSE” option are used to check the table’s structure. The “\d” and “\d+” are meta-commands and must be executed from the “SQL Shell” aka psql. Whil...
sql CREATETABLEAdventureWorks.dbo.#myTable (idintNOTNULL, lastNamevarchar(20), zipCodevarchar(6) )WITH( DISTRIBUTION =HASH(id), CLUSTERED COLUMNSTOREINDEX) ; Examples for table structure D. Create a table with a clustered columnstore index ...
This warning that prevents the actions from completing is caused by thePrevent saving changes that require table re-creationoption being triggered in SQL Server. This option lets SQL Server to prevent structure changes when a table needs to be recreated and is intende...
TRUNCATE TABLEremoves all rows from a table, but the table structure and its columns, constraints, indexes, and so on, remain. To remove the table definition in addition to its data, use theDROP TABLEstatement. If the table contains an identity column, the counter for that column is reset...
-- copy table structure onlySELECT*INTONewCustomersFROMCustomersWHEREfalse; Here, the SQL command creates an empty table namedNewCustomerswith the same structure as theCustomerstable. Also Read: SQL CREATE TABLE SQL INSERT INTO
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. ...