select table_id as id from table where id = 5 After new install on a Server he bring me an Error... Unknown column id in where clause Aboute the Documentation I cant use aliasnames in the where clause but all the time it was running!!! What is the Bug, how can i configure...
对于任何表达式都从不为 true:NULLexpr = NULLexpr = NULL SELECT * FROM my_table WHERE phone = NULL; 若要查找值,必须使用 IS NULL测试。 以下语句显示如何查找电话NULL号码和’ '电话号码: SELECT * FROM my_table WHERE phone IS NULL;SELECT * FROM my_table WHERE phone = ' '; COUNT 它计算行...
出现相同的字段报错:SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'company_id' in where clause is ambiguous 解决:取别名 代码语言:javascript 代码运行次数:0 AI代码解释 $query=MysqlTableName::find()->alias('c');
The WHERE clause determines which rows should be included in the GROUP BY clause, but it refers to the alias of a column value that is not known until after the rows have been selected, and grouped by the GROUP BY. In the select list of a query, a quoted column alias can be specif...
select IDfromvc_diagram where USER_ID ="+QaUtil.user_id +"AND NAME ="+diagramName+"; 查询时会报Unknown column ‘xxx’ in ‘where clause’ 因为USER_ID是整型,NAME是字符串类型,sql中字符串类型必须要包含在引号内,所以修改为: select IDfromvc_diagram where USER_ID ="+QaUtil.user_id +"AND...
MySQL用户帐号由两部分组成,如'USERNAME'@'HOST',表示此USERNAME只能从此HOST上远程登录;HOST用于限制此用户可通过哪些主机远程连接mysql程序。 HOST的值可为: IP地址,如:172.16.12.129 通配符 %:匹配任意长度的任意字符,常用于设置允许从任何主机登录 _:匹配任意单个字符 ...
1) where having 的过滤范围 having group by 、聚合函数 where select 字段 2)别名支持的位置 The alias is used as the expression's column name and can be used inGROUP BY,ORDER BY, orHAVINGclauses. 3) aHAVINGclause must come after anyGROUP BYclause and before anyORDER BYclause. ...
The error occurs because an alias names anoutputcolumn, whereas aWHEREclause operates oninputcolumns to determine which rows to select for output. To make the statement legal, replace the alias in theWHEREclause with the column or expression that the alias represents: ...
For this reason, it is good practice to be in the habit of usingASexplicitly when specifying column aliases. It is not permissible to refer to a column alias in aWHEREclause, because the column value might not yet be determined when theWHEREclause is executed. SeeSection B.3.4.4, “Probl...
I gave it, I believe, an appropriate alias because what was returned when I ran the show create table query was obviously corrupt data. I suppose it is a recurring problem with Php MyAdmin. I figured out a work-around, for the time being, for the problem that was presented by the err...