我是这样做的: 要select into语句给变量赋值，在if条件中根据该变量值进行判断. 示例:declarev_flag varchar(10);begin select case when exists (select tk_id from SIPRMA.SIPRMA_INV_TRANTK where tk_num = 'UWT140800266') then 'Y' else 'N' end as val into v_flag from dual...
I've found out that if I comment out the if statements that contain "IF NOT EXISTS () THEN" then my stored procedure will run. And if I just remove the word "NOT" then it'll run. Maybe the use of the word "NOT" was incorrect, however I would expect an error message. I now k...
我们可以使用以下代码来判断: IF(SELECTCOUNT(*)FROMinformation_schema.TABLESWHERE(TABLE_SCHEMA='your_database_name')AND(TABLE_NAME='your_table_name'))=0THEN-- 对象不存在,执行创建操作ELSE-- 对象已存在,不执行创建操作ENDIF; 1. 2. 3. 4. 5. 6. 7. 8. 上述代码中,我们使用了IF语句和COUNT(*...
USEtestdb;IFNOTEXISTS(SELECT1FROMinformation_schema.TABLESWHERETABLE_SCHEMA='testdb'ANDTABLE_NAME='employees')THENCREATETABLEemployees(idINTPRIMARYKEYAUTO_INCREMENT,nameVARCHAR(100),ageINT,salaryDECIMAL(10,2));SELECT'表已创建。';ELSESELECT'表已存在。';ENDIF; 1. 2. 3. 4. 5. 6. 7. 8. 9....
网上文章提及的不多,这里出现了,我就作个补充吧~tag along (with):跟着一起来麦克米伦词典英语释义:to go somewhere with someone else although you are not needed例句:When Charlie goes on a business trip, I often tag along.当Charlie出差时我一般都会跟着去。注:这大概也可以用来形容“屁颠屁颠地跟着来...
i want something else i want speak you i want spring rolls i want strawberry i want this to happen i want to be a comput i want to be a firefi i want to be a millio i want to be freebaby i want to buy this en i want to feel someth i want to go on beaut i want to have...
if d if - intermediate fre if a city is not well if a face could launc if a little higher if a man loses the ha if a picture paints a if a song could get m if accepted if all else fails if an animal if an opportunity ari if any enquiry if anyone finds out if anyone heard ...
2.给表添加字段 语法：alter table tablename add (column datatype [default value][null/not nul...
if 如果 和 then 在一行,需要加 ; 单分支 if [ 条件判断式 ];then 命令 fi 或者 if [ 条件判断式 ] then 命令 fi 双分支 if [ 条件判断式 ] then 命令 else 命令 fi 多分支 if [ 条件判断式1 ] then 命令 elif [ 条件判断式2 ]
网络除非…否则 网络释义 1. 除非…否则 Module 6 Unit 2 What is happiness... ... as well also 也,还,和 conj.except if除非…否则… could have+p.p. 表示虚拟语气 ... www.5ykj.com|基于3个网页 释义: 全部,除非…否则