IF EXISTS(SELECT * FROM sys.indexes WHERE object_id = object_id('schema.tablename') AND NAME ='indexname') DROP INDEX indexname ON SCHEMA.tablename; CREATE INDEX indexname ON SCHEMA.tablename(columnlist); Why not simply: Create Index IndexName on schema.tablename (columnlist) with (drop...
十三、sql server not exists exists : 强调的是是否返回结果集,不要求知道返回什么, 比如: select name from student where sex = 'm' and mark exists(select 1 from grade where ...) ,只要 exists引导的子句有结果集返回,那么exists这个条件就算成立了,大家注意返回的字段始终为1,如果改成“select 2 from...
我有一个 SQL Server Dockerfile,我的 import-data.sh 从 sql-data 文件夹导入*.sql文件。如果我从 Datagrip 之类的工具运行*.sql文件,则一切正常,但在自动运行时导入失败并显示此错误消息。 错误信息: Msg 1934, Level 16, State 1, Line 4 CREATE INDEX failed because the following SET options have in...
sql-data-type SQL1VARCHAR(integerOCTETS)HASHEDDOUBLEINTEGERINTDECIMALDECNUMERICNUM(5,0)( integer,0, integer)DATETIMESTAMP Notes: 1If you specify a function name, such as fn:upper-case, at the end of the XML pattern, the supported index data types might be a subset of the index data...
The Database Engine doesn't allow creating a unique index on columns that already include duplicate values, whether or not IGNORE_DUP_KEY is set to ON. If this is attempted, the Database Engine displays an error message. Duplicate values must be removed before a unique index can be created...
The Database Engine doesn't allow creating a unique index on columns that already include duplicate values, whether or not IGNORE_DUP_KEY is set to ON. If this is attempted, the Database Engine displays an error message. Duplicate values must be removed before a unique index can be creat...
USE AdventureWorks2022; GO DROP INDEX IF EXISTS FIBillOfMaterialsWithEndDate ON Production.BillOfMaterials GO CREATE NONCLUSTERED INDEX FIBillOfMaterialsWithEndDate ON Production.BillOfMaterials (ComponentID, StartDate) WHERE EndDate IS NOT NULL ; GO The filtered index FIBillOfMaterialsWithEndDate...
If an XML index exists, the clustered, primary key of the table can't be modified. You'll have to drop all XML indexes on the table before modifying the primary key. A primary XML index can be created on a single xml type column. You can't create any other type of index with the...
To create a unique index on a table, using: SQL Server Management Studio Transact-SQLBefore You BeginBenefits of a Unique IndexMulticolumn unique indexes guarantee that each combination of values in the index key is unique. For example, if a unique index is created on a combination of L...
CREATE EVENT SESSION (Transact-SQL) CREATE FULLTEXT CATALOG (Transact-SQL) CREATE FULLTEXT INDEX (Transact-SQL) CREATE FULLTEXT STOPLIST (Transact-SQL) CREATE FUNCTION (Transact-SQL) CREATE INDEX (Transact-SQL) CREATE LOGIN (Transact-SQL) ...