SQL0803N One or more values in the INSERT statement, UPDATE statement, or foreign key update caused by a DELETE statement are not valid because the primary key, unique constraint or unique index identified by "1" constrains table "MELNYK.ORG_TEMP" from having duplicate rows for those columns....
此外,還可以使用 CREATE TABLE 和ALTER TABLE 陳述式來設定 PRIMARY KEY 和UNIQUE 條件約束上的鎖定資料粒度。 為了提供回溯相容性,sp_indexoption 系統預存程序也可以設定資料粒度。 若要顯示指定之索引的目前鎖定選項,請使用 INDEXPROPERTY 函數。 分頁層級鎖定、資料列層級鎖定、或是分頁層級與資料列層級...
INSERT INTO SC_U(Sno,Cno,OldGrade,NewGrade) VALUES(OldTuple.Sno,OldTuple.Cno,OldTuple.Grade,NewTuple.Grade) [例5.22] 将每次对表Student的插入操作所增加的学生个数 记录到表StudentInsertLog中。 CREATE TRIGGER Student_Count AFTER INSERT ON Student REFERENCING NEW TABLE AS DELTA FOR EACH STATEMENT ...
sql_statement_recompile扩展事件 (XEvent) 报告语句级重新编译。 当任何类型的批处理需要语句级重新编译时,会发生此 XEvent。 这包括存储过程、触发器、即席批处理和查询。 可通过几个接口来提交批处理,这类接口包括 sp_executesql、动态 SQL、“准备”方法或“执行”方法。
For unique indexes, the valid range of prefix length values is from 1 to the number of key columns minus 1. The default prefix length is the number of key columns minus 1. For nonunique indexes, the valid range of prefix length values is from 1 to the number of key columns. The ...
For unique indexes, the range of valid prefix length values is from 1 to the number of key columns minus 1. The default prefix length is the number of key columns minus 1. For nonunique indexes, the range of valid prefix length values is from 1 to the number of key columns. The de...
FOR EACH STATEMENT INSERT INTO StudentInsertLog (Numbers) SELECT COUNT(*) FROM DELTA 1. 2. 3. 4. 5. 6. 7. T-SQL version --新建表StudentInsertLog,存储学生人数 CREATE TABLE StudentInsertLog ( Numbers INT ) --新建表StudentInsertLogUser,存储用户名和操作时间 ...
To generate unique values for each column, either use the NEWID or NEWSEQUENTIALID function on INSERT statements. Or, specify the NEWID or NEWSEQUENTIALID function as the default for the column. [ {ADD | DROP} PERSISTED ] Specifies that the PERSISTED property is added to or dropped from the ...
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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...