The error message “Could not drop object 'production.brands' because it is referenced by a FOREIGN KEY constraint. (Microsoft SQL Server, Error: 3726)” is telling us why the table cannot be dropped. In this case we would need to step through dropping the constraints then dropping the tab...
);2.查看约束的定义信息--查看表的约束SQL>SELECTowner,constraint_name,constraint_type,table_name,status,deferrable,validatedFROMuser_constraintsORDERBYtable_name; OWNER CONSTRAINT_NAME C TABLE_NAME STATUS DEFERRABLE VALIDATED--- --- - --- --- --- ---ROBINSON SYS_C005543 C TB_CONSTRAINT_1 ENA...
Table-Valued Parameters Primary keys Foreign keys Unique constraints and check constraints Check constraints Temporal tables Tutorials Reference Track changes Triggers User-defined functions Views XML data Development Internals & Architecture Installation ...
适用于:SQL Server Azure SQL 数据库 Azure SQL 托管实例 Microsoft Fabric SQL 数据库在数据库中创建新表。备注 有关Microsoft Fabric 中仓库的引用,请访问 CREATE TABLE (Fabric 数据仓库)。 有关Azure Synapse Analytics 和 Analytics Platform System (PDW) 的参考,请访问 CREATE TABLE (Azure Synapse Analytics...
LEFTJOININFORMATION_SCHEMA.TABLE_CONSTRAINTS tab_con ONtab_con.CONSTRAINT_NAME = ref_con.CONSTRAINT_NAME FORXML PATH('')),1,1,'') EXECUTE(@sql_3) GO /* Drop tables */ EXECsp_MSForEachTable'DROP TABLE ?' GO Method 2: Here is the old method which I’ve used before. This method ...
Large numbers of indexes on a table affect the performance of INSERT, UPDATE, DELETE, and MERGE statements because all indexes must be adjusted appropriately as data in the table changes. For example, if a column is used in several indexes and you execute an UPDATE statement that modifie...
After implicit transaction mode has been set on for a connection, the instance of the Database Engine automatically starts a transaction when it first executes any of these statements: ALTER TABLE CREATE DELETE DENY DROP FETCH GRANT INSERT OPEN REVOKE SELECT TRUNCATE UPDATE Batch-scoped Transa...
SERVER ROLE SERVICE SERVICE MASTER KEY SYMMETRIC KEY TABLE TABLE column_constraint TABLE column_definition TABLE computed_column_definition TABLE index_option TABLE table_constraint TRIGGER User VIEW WORKLOAD GROUP XML SCHEMA COLLECTION バックアップと復元 CREATE 照合順序 DROP アクセス許可 Service Brok...
SQL_CREATE_TABLE SQL_CREATE_TRANSLATION SQL_DDL_INDEX SQL_DROP_ASSERTION SQL_DROP_CHARACTER_SET SQL_DROP_COLLATION SQL_DROP_DOMAIN SQL_DROP_SCHEMA SQL_DROP_TABLE SQL_DROP_TRANSLATION SQL_DROP_VIEW SQL_EXPRESSIONS_IN_ORDERBY SQL_GROUP_BY SQL_IDENTIFIER_CASE SQL_IDENTIFIER_QUOTE_CHAR SQL_INDEX_...
TheALTER TABLEstatement is also used to add and drop various constraints on an existing table. ALTER TABLE - ADD Column To add a column in a table, use the following syntax: ALTERTABLEtable_name ADDcolumn_name datatype; The following SQL adds an "Email" column to the "Customers" table:...