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...
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...
Re: Using a Variable's Value or Table Alias in WHERE Clause? Posted by:kNish Singhai Date: November 14, 2007 01:40AM Hi, 1) my page has a drop down and navigator suite. Is it possible to pass down a value from the drop down menu to the navigator suite "select ...where " ...
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...
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...
Note that ANSI SQL doesn’t allow you to refer to an alias in aWHEREclause. This is because when theWHEREcode is executed the column value may not yet be determined. For example, the following query isillegal: SELECT id,COUNT(*) AS cnt FROM table_name WHERE cnt > 0 GROUP BY id; ...
Description:I use an alias in a select for the fields name. When I use the method Update, the program generate the error: "[MySql][ODBC 3.51 Driver][MySql-5.0.0-alpha-nt] Unknown column 'col1' in 'where clause'". Example Visual Basic 6: ' In a form with a command button named ...
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. ...
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 复制 $query=MysqlTableName::find()->alias('c');
MAX() in WHERE clause Syed Mairaj November 14, 2009 01:42AM Re: MAX() in WHERE clause laptop alias November 14, 2009 04:46AM Re: MAX() in WHERE clause Chad Bourque November 14, 2009 09:28AM Sorry, you can't reply to this topic. It has been closed. ...