In your table dbo.Sup_Item_Cat, it has a foreign key reference to another table. The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table. If you have SQL Server Management Studio, open it up and sp_help ‘dbo.Sup_Item_Cat‘. See which column that FK … Read more
Try this (in the psql command-line tool): See the manual for more info.
You need to consider that GROUP BY happens after the WHERE clause conditions have been evaluated. And the WHERE clause always considers only one row, meaning that in your query, the meta_key conditions will always prevent any records from being selected, since one column cannot have multiple values for one row. And what about the redundant meta_value checks? If a value is allowed to … Read more
You need to alias the subquery. or to be more explicit
You don’t have full joins in MySQL, but you can sure emulate them. For a code sample transcribed from this Stack Overflow question you have: With two tables t1, t2: The query above works for special cases where a full outer join operation would not produce any duplicate rows. The query above depends on the UNION set operator to remove duplicate rows introduced by the query pattern. … Read more
An identifying relationship is when the existence of a row in a child table depends on a row in a parent table. This may be confusing because it’s common practice these days to create a pseudokey for a child table, but not make the foreign key to the parent part of the child’s primary key. Formally, the “right” way … Read more
For MySQL 5.0.3 and higher, you can use BIT. The manual says: As of MySQL 5.0.3, the BIT data type is used to store bit-field values. A type of BIT(M) enables storage of M-bit values. M can range from 1 to 64. Otherwise, according to the MySQL manual you can use BOOL or BOOLEAN, which are at the moment … Read more
The user and password are DEFINITELY incorrect. Oracle 11g credentials are case sensitive. Try ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON = FALSE; and alter password. http://oracle-base.com/articles/11g/case-sensitive-passwords-11gr1.php
There are several ways that you can transform data from multiple rows into columns. Using PIVOT In SQL Server you can use the PIVOT function to transform the data from rows to columns: See Demo. Pivot with unknown number of columnnames If you have an unknown number of columnnames that you want to transpose, then you can use dynamic SQL: See Demo. Using … Read more
It may be easier to check if the connection and re-establish it if needed. See PHP:mysqli_ping for info on that.