# 模糊批量替换关键字 update blog_chat set messages=REPLACE(messages,’admin’,’管理员’) where messages like ‘%admin%’ 语法REPLACE ( string_expression , string_pattern , string_replacement ) 参数string_expression 要搜索的字符串表达式。string_expression 可以是字符或二进制数据类型。 string_pattern...
1.select子句中尽量避免使用* select子句中，*是选择全部数据的意思。比如语句：“select * from 成绩表...
USE sql_store; select *from customerswhere address like ‘%Trail%’ oraddress like ‘%avenue%’LIKE 执行优先级在逻辑运算符之后,毕竟 IN BETWEEN LIKE 本质可看作是比较运算符的简化,应该和比较运算同级,数学→比较→逻辑,始终记住这个顺序,上面这个如果用正则表达式会简单得多 where phone like ‘%9’/wh...
CREATETABLEpar_table(viewTimeINT,useridBIGINT,page_urlSTRING,referrer_urlSTRING,ipSTRINGCOMMENT'IP Address of the User')COMMENT'This is the page view table'PARTITIONEDBY(dateSTRING,posSTRING)CLUSTEREDBY(userid)SORTEDBY(viewTime)INTO32BUCKETSROWFORMATDELIMITED‘\t’FIELDSTERMINATEDBY'\n'STOREDASSEQUEN...
SQL20259N 無法從全選的 FROM 子句中資料變更陳述式的目標選取直欄 column-name。 解說 選取了一個無法指定在此查詢之選取清單中的直欄。此直欄是以視圖或全選中的一個直欄為基礎,而視圖或全選為 INSERT 或 UPDATE 陳述式(使用 NEW TABLE 或 FINAL TABLE 在 FROM 子句中指定)的目標。選取的直欄是根據: ...
replace(str,s1,s2)用s2替换s中的s1 UPDATE new_prd_products_add_clean SET theme_ch = REPLACE(theme_ch, '-', '、'); -小写,大写lower(), upper() UPDATE artist_ch SET personName = LOWER(personName); -转数据类型 int转string:ltrim(列名) ...
master..sysprocesses where SPID = @@SPID', @counter INT=1, @Max INT, @Sql VARCHAR(mAX);IF OBJECT_ID('TempDB..#TrigUpdate') IS NOT NULL DROP TABLE #TrigUpdate;CREATE TABLE #TrigUpdate ( SqlVar VARCHAR(MAX) , RowID INT );INSERT INTO #TrigUpdateSELECT REPLACE(REPLACE(t.definition, @...
create procedure update_salary_if (in employee_number char(6), inout rating smallint) language sql begin declare not_found condition for sqlstate '02000'; declare exit handler for not_found set rating = -1; if rating = 1 then update employee ...
SELECTEmail,REPLACE(EMail,'abc.com','***.com')AS DisplayEmailFROMEmployee; Example 4 TheREPLACE()function can also be used to update the column data of the table. Consider the followingEmployeedata whereDepartmentID=60. Now, the following updates the domain of all email to 'companyHR.com'...
mysql> UPDATE string_tbl -> SET vchar_fld = 'This is a piece of extremely long varchar data'; ERROR 1406 (22001): Data too long for column 'vchar_fld' at row 1 自MySQL 6.0以来,默认的处理方式是“strict”模式,表示在出现问题时抛出异常,而在旧版本的服务器中,默认方式是截断字符串并发出警...