There are many split function version online, if you just google SQL Server Split function you ...
A UNIQUE index creates a constraint such that all values in the index must be distinct. An error occurs if you try to add a new row with a key value that matches an existing row. If you specify a prefix value for a column in a UNIQUE index, the column values must be unique within ...
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UPDATE table_name SET column1 = value1, column2 = value2, … WHERE condition; The WHERE clause specifieswhich record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated. (1) The following SQL statement updates the first customer (CustomerID...
Case statement with Between in Where Clause Case statement with Date Comparison CASE statement with substring CASE WHEN - Adding collate into it. Case WHEN and concatenate string CASE WHEN isnumeric(ColValue) THEN ... ELSE ... END CASE WHEN MIN,SUM ETC. CASE WHEN Problem with CASE NULL cas...
RAND()inaWHEREclause is re-evaluated every time theWHEREis executed.You cannot use a columnwithRAND()valuesinanORDERBYclause,becauseORDERBYwould evaluate the column multiple times.--这个bug会爆出duplicate key这个错误,然后顺便就把数据也给爆了 ...
Multiple Active Result Sets (MARS) 支援資料行存放區索引。 全新的sys.dm_db_column_store_row_group_physical_stats (Transact-SQL)(部分機器翻譯) 動態管理檢視,可提供資料列群組層級的效能疑難排解資訊。 資料行存放區索引上的單一執行緒查詢可以批次模式執行。 以前只有多執行緒查詢可以批次模式執行。
In other cases, we want to fetch records where a specific character is equal to a specific value. For example, to fetch the record where the second character is “x”, we can run the code: The code above should return: SQL Like Multiple Conditions ...
The--hostnameparameter, as discussed previously, changes the internal name of the container to a custom value. This value is the name you see returned in the following Transact-SQL query: SQL SELECT@@SERVERNAME, SERVERPROPERTY('ComputerNamePhysicalNetBIOS'), SERVERPROPERTY('MachineName'), SERVER...
报错:Update row with Key (id)=(xxxx) multiple times或者duplicate key value violates unique constraint 问题原因:违反唯一性约束,执行UPDATE、INSERT ON CONFLICT或INSERT操作时,主键存在重复数据。 解决方法: 若INSERT语法报错:可以改为INSERT INTO xx ON CONFLICT的语法,实现主键去重,详情请参见INSERT ON CONFLIC...