你Out了,用下面sql语句可以根据判断进行添加删除和修改,灵活运用让你爽到没有明天 if EXISTS(select * from Order where Id='243320') select * from Order where Id='243318' else select * from Order where Id='243317'
You do an insert with the data and if you've got an existing unique key (which isn't auto-incremented), if it exists, the insert will throw an error.Catch the error and then do an update.OrUse auto-incremented primary key and all inserts will be on a new line.Or...
1 MySQL - UPDATE or INSERT if exists 0 mysql update and insert statements based on another table 0 Insert and update in mysql 2 sql insert or update by comparing values 1 MySQL UPDATE, IF, INSERT INTO statement 0 SQL : Insert Or Update command 1 Conditional insert or update in ...
26 SQLite Query to Insert a record If not exists 0 SQLite: update a record if exists, otherwise insert it? 12 SQLite: possible to update row or insert if it doesn't exist? 2 if exist update or else insert in sqlite3 8 SQL: How to update or insert if doesn't exist? 1 SQLite ...
INSERTINTOtable(SELECTid,'hisname'asnameFROMtableWHEREid>=3)ONDUPLICATEKEYUPDATEname=VALUES(name); 这种方法还可以用来批量执行UPDATE操作(因为单条UPDATE语句只能执行一种update操作) 方法二: 创建存储过程 CREATEPROCEDUREname()ifexists(select1from表whereID=@ID)beginUPDATE表SETXX=XXWHEREID=@IDendelsebegin...
更新操作可以使用UPDATE语句,根据需要更新的字段和更新条件进行更新。例如,更新字段为"age=30",更新条件为"username='John'",则更新语句可以是:UPDATE users SET age=30 WHERE username='John'; 执行更新语句,完成更新操作。 如果需要,可以返回更新后的记录或执行其他操作。 这种查询-更新/插入操作常用于...
to be updated if it already exists and inserted if it does not. If we refer to the Books Online documentation, it gives examples that are similar to:IF EXISTS (SELECT * FROM Table1 WHERE Column1='SomeValue') UPDATE Table1 SET (...) WHERE Column1='SomeValue' ELSE INSERT INTO Table1...
then it would be useful to have an option on extra_data.to_sql() that allows to pass the DataFrame to SQL with an INSERT or UPDATE option on the rows, based on the primary key. In this case, the id=2 row would get updated to age=44 and the id=3 row would get added Expected ...
if exists(select * from sysobjects where name='Insert_Or_Update_sal') drop trigger Insert_Or_Update_salgoCREATE TRIGGER Insert_Or_Update_sal ON TEACHER FOR insert,update AS BEGIN declare @job char(8),@sal numeric(7,2),@eno numeric(4) --inserted是insert或update触发表临时表,参考下面...
IF EXISTS ( SELECT 1 FROMTest WHERE Id = @Id) UPDATETest SET [Counter] = [Counter] + 1 WHERE Id = @Id; ELSE INSERTTest ( Id, Name, [Counter]) VALUES ( @Id, @Name, 1); COMMIT 【1.1】高并发下的问题 一个很明显的问题,在高并发下可能存在操作同一条记录的多个线程都进入到INSERT环节...