How do I count unique items in field in Access query?
Try this Read this for more info.
SQL
Arithmetic overflow error converting varchar to data type numeric. ’10’ <= 9.00
This generates an Arithmetic Overflow because it is trying to implicitly cast the Val column to a NUMERIC(3,2), which naturally will overflow on a 2-digit value like 10. It’s using NUMERIC(3,2) as the target type and size because that is the smallest numeric that 9.00 appears to fit into. The solution, of course, is to use explict CASTing instead … Read more
MySQL error: Unknown column in ‘where clause’
backticks (`) are used for identifiers, like table names, column names, etc. Single quotes(‘) are used for string literals. You want to do: Or, to be more explicit: When there is no chance of ambiguity, and when table/column names do not have special characters or spaces, then you can leave the ` off. Here is … Read more
What are database constraints?
Constraints are part of a database schema definition. A constraint is usually associated with a table and is created with a CREATE CONSTRAINT or CREATE ASSERTION SQL statement. They define certain properties that data in a database must comply with. They can apply to a column, a whole table, more than one table or an entire schema. A reliable … Read more
PHP Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in /home/website/public_html/facebook/fbclogin.php on line 57 [duplicate]
This means the MySQL query did not execute correctly. You can use this to figure out what went wrong: although in this case it seems the problem is that you have not enclosed table and column names within the required ` marks, so try
What datatype should be used for storing phone numbers in SQL Server 2005?
Does this include: International numbers? Extensions? Other information besides the actual number (like “ask for bobby”)? If all of these are no, I would use a 10 char field and strip out all non-numeric data. If the first is a yes and the other two are no, I’d use two varchar(50) fields, one for the … Read more
MySQL – Get row number on select
Take a look at this. Change your query to: The last select is your count.
How can I group by date time column without taking time into consideration
Cast/Convert the values to a Date type for your group by.
Text was truncated or one or more characters had no match in the target code page including the primary key in an unpivot
I know this is an old question. The way I solved it – after failing by increasing the length or even changing to data type text – was creating an XLSX file and importing. It accurately detected the data type instead of setting all columns as varchar(50). Turns out nvarchar(255) for that column would have … Read more
Is there a coalesce-like function in Excel?
This is an Array Formula. After entering the formula, press CTRL + Shift + Enter to have Excel evaluate it as an Array Formula. This returns the first nonblank value of the given range of cells. For your example, the formula is entered in the column with the header “a”