UPDATEESETE.Location=CASEWHEND.Location='New York'THEN'NY'WHEND.Location='London'THEN'LDN'ELSE'Other'END,E.DepartmentName=D.DepartmentNameFROMEmployees EJOINDepartment DONE.DepartmentName=D.DepartmentNameWHEREE.DepartmentNameISNOTNULL; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14...
UPDATE语句后面跟FROM的使用 有时候,我们需要根据另一个表中的数据来更新目标表中的数据,这时就需要使用UPDATE语句后面跟FROM子句的方式。具体语法如下: UPDATEtable_nameSETtable_name.column1=other_table.column1,table_name.column2=other_table.column2FROMtable_nameINNERJOINother_tableONtable_name.join_column=...
MERGE INTO YourTable T USING other_table S ON T.id = S.id AND S.tsql = 'cool' WHEN MATCHED THEN UPDATE SET col1 = S.col1, col2 = S.col2; 或者 MERGE INTO YourTable T USING ( SELECT id, col1, col2 FROM other_table WHERE tsql = 'cool' ) S ON T.id = S.id WHEN MAT...
方法1: UPDATE lpmgmt t1 LEFT JOIN lpmgmt_other t2 ON t2.lpmgmt_id = t1.id SET t1.lpEntityType2 = t2.lpEntityType2 方法2: update table1 set field1=table2.field1 fromtable2 where table1.id=table2.id 方法3: updatetable1 set field1=(select top 1 field1 from table2 where table...
We can UPDATE a table with data from any other table in SQL. Let us consider the following two tables. CREATE TABLE student_old ( student_id INT ,
语句已终止。产生这类信息的原因是，你创建了默认的外键约束。默认的就是，为了保证数据的完整性，比如有父子关系的两表。你必须先删除掉子表的数据，让父表的数据，没有子表数据的时候，才能删除。目的是为了避免，子表中有太多的 孤儿数据。如果想避免，可以加上 DELETE CASCADE / UPDATE CASCADE ...
If the object being updated appears more than one time in the FROM clause, one, and only one, reference to the object must not specify a table alias. All other references to the object in the FROM clause must include an object alias. A view with an INSTEAD OF UPDATE trigger can't be...
UPDATEtable_name SETcolumn1=value1,column2=value2, ... WHEREcondition; Note:Be careful when updating records in a table! Notice theWHEREclause in theUPDATEstatement. TheWHEREclause specifies which record(s) that should be updated. If you omit theWHEREclause, all records in the table will be...
原文:SQL Server 2012 中 Update FROM子句 首先说明一下需求以及环境 创建Table1以及Table2两张表,并插入一下数据 USEAdventureWorks2012; GO IFOBJECT_ID('dbo.Table1','U')ISNOTNULL DROPTABLEdbo.Table1; GO IFOBJECT_ID('dbo.Table2','U')ISNOTNULL ...
报错:failed to import foreign schema from odps:Table not found -xxx 问题原因:查询的表在MaxCompute中不存在。 解决方法:前往MaxCompute确认表是否存在。 ERRCODE_UNIQUE_VIOLATION或者pk violates 报错:Update row with Key (id)=(xxxx) multiple times或者duplicate key value violates unique constraint ...