ifnot exists(select1fromtwhereid=1)insertintot(id,update_time)values(1,getdate())elseupdate tsetupdate_time=getdate()whereid=1或者ifexists(select1fromtwhereid=1)insertintot(id,update_time)values(1,getdate())elseupdate tsetupdate_time=getdate()whereid=1 mysql replace into 跟 insert 功...
insertintot(id, update_time)values(1, getdate())elseupdate tsetupdate_time= getdate()whereid =1或者ifexists(select1fromtwhereid =1) insertintot(id, update_time)values(1, getdate())elseupdate tsetupdate_time= getdate()whereid =1 mysql replace into 跟 insert 功能类似,不同点在于:repl...
ifnotexists(select1fromtwhereid=1)insertintot(id,update_time)values(1,getdate())elseupdate tsetupdate_time=getdate()whereid=1或者ifexists(select1fromtwhereid=1)insertintot(id,update_time)values(1,getdate())elseupdate tsetupdate_time=getdate()whereid=1 1. 2. 3. 4. 5. 6. 7. 8...
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=@IDendelsebeginI...
2、使用UPDATE/INSERT/DELETE操作 虽然SELECT+WITH(XLOCK)查询提示能做到加X锁,但是这种X锁有点“不靠谱”,MSDN给出解释: Using XLOCK in SELECT statements will not prevent reads from happening. This is because SQL Server has a special optimization under read committed isolation level that checks if th...
sql中同一个Trigger里同时包含Insert,Update,Delete SQLServer是靠Inserted表和Deleted表来处理的,判断一下就可以了,只不过比ORACLE麻烦一点createtrigger触发名on表名 insteadofinsert,update,deleteas--insert插入ifnotexists(select1fromdeleted)begin打印插入end--update更新ifexists(select1frominserted)andexists(select1...
IF EXISTS(SELECT 1 FROM sys_emp a,inserted b join hr_emp_title c on b.empid = c.empid)BEGIN update c set c.title_code = b.title_code from inserted b join hr_emp_title c on b.empid = c.empid END 不存在就插入 ELSE BEGIN insert into hr_emp_title(empid,title_code) ...
在Spark SQL中,可以使用INSERT IF NOT EXISTS ELSE UPDATE语句来实现这一功能。具体的语法如下: 代码语言:txt 复制 INSERT INTO table_name SELECT * FROM new_data WHERE NOT EXISTS ( SELECT 1 FROM table_name WHERE condition ) ELSE UPDATE table_name SET column1 = value1, column2 = value2, ...
在PostgreSQL中,可以使用INSERT语句插入数据到表中,同时也可以使用UPDATE语句更新表中已存在的数据。对于非唯一列,可以使用条件判断来实现插入不存在的数据和更新已存在的数据。 要实现"Insert if not exists,Update if exists on non unique列"的功能,可以使用以下方法: 使用INSERT INTO ...
IFNOTEXISTS(SELECT*FROMClockWHERE(clockDate=GETDATE())AND(userName='test'))BEGININSERTINTOClock(clockDate, userName, breakOut)Values(GETDATE(),'test', GETDATE())ENDELSEBEGINUPDATEClockSETbreakOut=GETDATE()WHERE(clockDate=GETDATE())AND(userName='test')END ...