SQL statement not working – “Operand type clash: date is incompatible with int’
Your date format is incorrect, it needs to be in quotes and rearranged slightly. or rather
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Postgres Error: More than one row returned by a subquery used as an expression
Technically, to repair your statement, you can add LIMIT 1 to the subquery to ensure that at most 1 row is returned. That would remove the error, your code would still be nonsense. Practically, you want to match rows somehow instead of picking an arbitrary row from the remote table store to update every row of your local table customer.Your rudimentary question … Read more
I got error “The DELETE statement conflicted with the REFERENCE constraint”
The error means that you have data in other tables that references the data you are trying to delete. You would need to either drop and recreate the constraints or delete the data that the Foreign Key references. Suppose you have the following tables Suppose a Foreign Key constraint exists between the StudentTypeId column in StudentTypes and the StudentTypeId column in Students … Read more
MySQL – UPDATE multiple rows with different values in one query
You can do it this way: I don’t understand your date format. Dates should be stored in the database using native date and time types.
TSQL PIVOT MULTIPLE COLUMNS
Since you want to pivot multiple columns of data, I would first suggest unpivoting the result, score and grade columns so you don’t have multiple columns but you will have multiple rows. Depending on your version of SQL Server you can use the UNPIVOT function or CROSS APPLY. The syntax to unpivot the data will be similar to: See SQL Fiddle … Read more
How to write a SQL DELETE statement with a SELECT statement in the WHERE clause?
You need to identify the primary key in TableA in order to delete the correct record. The primary key may be a single column or a combination of several columns that uniquely identifies a row in the table. If there is no primary key, then the ROWID pseudo column may be used as the primary … Read more
pg_ctl: no database directory specified and environment variable PGDATA unset
You need to specify where the database directory is installed to. eg Failing that you will need to set the environment variable PGDATA. Something like
Why is SQL server throwing this error: Cannot insert the value NULL into column ‘id’?
I’m assuming that id is supposed to be an incrementing value. You need to set this, or else if you have a non-nullable column, with no default value, if you provide no value it will error. To set up auto-increment in SQL Server Management Studio: Open your table in Design Select your column and go to Column Properties Under Indentity … Read more
“You tried to execute a query that does not include the specified aggregate function”
The error is because fName is included in the SELECT list, but is not included in a GROUP BY clause and is not part of an aggregate function (Count(), Min(), Max(), Sum(), etc.) You can fix that problem by including fName in a GROUP BY. But then you will face the same issue with surname. So put both in the GROUP BY: Note I used Count(*) where you wanted SUM(orders.quantity). However, orders isn’t included … Read more
What is the difference between a stored procedure and a view?
A view represents a virtual table. You can join multiple tables in a view and use the view to present the data as if the data were coming from a single table. A stored procedure uses parameters to do a function… whether it is updating and inserting data, or returning single values or data sets. … Read more