您可以在使用游標擷取資料列時更新資料列。 在select 陳述式上,使用 FOR UPDATE OF ,後面接著可更新的直欄清單。 然後使用游標控制的 UPDATE 陳述式。 WHERE CURRENT OF 子句會將游標命名為指向您要更新的列。 如果未指定 FOR UPDATE OF、ORDER BY、FOR READ ONLY 或不含 DYNAMIC 子句的 SCROLL 子句,則可以更...
AI代码解释 create tableab(product_id int,product_namevarchar(10),product_type_idvarchar(10));insert into abvalues(1,'产品A','1,2'),(2,'产品B','2,3');create tableac(product_type_id int,product_type_namevarchar(10));insert into acvalues(1,'类别1'),(2,'类别2'),(3,'类别3')...
第一部分:基础——增删查改【第一章】做好准备 Getting Started (时长25分钟)【第二章】在单一表格中检索数据 Retrieving Data From a Single Table (时长53分钟)【第三章】在多张表格中检索数据 Retrieving Data From Multiple Tables (时长1小时2分)【第四章】插入、更新和删除数据 Inserting, Updating, an...
Create Or Replace Trigger Trg_InsUpdDel_t Instead Of Insert or update or delete on t for each row Declare begin If Inserting Then Insert Into t1 (t11,t12) Values (:New.f1,:New.f2); Insert Into t2 (t11,t22) Values (:New.f1,:New.f3); elsif Updating Then Update t1 set t11=:New....
mysql tablesinuse1,locked1LOCKWAIT3lockstruct(s),heap size1136,2rowlock(s),undo log entries1MySQL thread id4,OSthread handle68972,query id398localhost::1root updating--SQL2更新id为2的 update usersetage=2where id=2***(1)WAITINGFORTHISLOCKTOBEGRANTED:RECORDLOCKSspace id495page no3n bits72...
TIP:Notice that our UPDATE statement included anEXISTS conditionin the WHERE clause to make sure that there was a matchingproduct_idin both theproductsandsummary_datatable before updating the record. If we hadn't included the EXISTS condition, the UPDATE query would have updated thecurrent_categor...
In the above example, we’reUPDATINGthebooks.primary_authorfield to match thefor ‘The Hobbit’ byJOININGboth tables in the query to their respective, matching values ofauthors.idandbooks.author_id. 在上述例子中,我们UPDATINGbooks.primary_author=通过JOINING匹配“霍比特” 在查询到它们各自的两个表,...
In the above example, we’reUPDATINGthebooks.primary_authorfield to match theauthors.namefor ‘The Hobbit’ byJOININGboth tables in the query to their respective, matching values ofauthors.idandbooks.author_id. 在上述例子中,我们UPDATINGbooks.primary_author=authors.name通过JOINING匹配“霍比特” 在查...
I am new to excel vba and i have absolutely no idea of how to achieve this. i want to insert and update a sql server table using excel macro. currently i have done it for the update can someone please help me in adding the insertion code. ...
SQL |更新语句 原文:https://www.geeksforgeeks.org/sql-update-statement/ SQL 中的 UPDATE 语句用于更新数据库中现有表的数据。根据我们的需求,我们可以使用 update 语句更新单个列和多个列。基本语法 UPDATE table_name SET column1 = value1, column2 = value2,...