mySQL Combining the results of searches - php

Question

My problem is:
I have a dbase query (A) with events_A with today date
$STH_1 = $DBH_R->query("SELECT table_name
FROM information_schema.tables
WHERE table_name
LIKE 'v_c_ei\_9%' ");
$stmts_1 = array();
while (($row_1 = $STH_1 -> fetch_assoc()) !== null){
$table_name = $row_1['table_name'];
$stmts_1[] = sprintf("
SELECT *
FROM $table_name
WHERE date_time = $today_date
");
}
$stmt_1 = implode("\nUNION\n", $stmts_1);
$stmt_1 .= "\nORDER BY date_time ASC";
$STH_5_2 = $DBH_R->query($stmt_1);
while (($row_5_2 = $STH_5_2 -> fetch_assoc()) !== null) { }
and I can display the results from this in the table_A.
But I have a dbase query (B) with events_B with today date
$table_name_2 = 'v_c_e';
$STH_e = $DBH_R->query("
SELECT *
FROM `$table_name_2`
WHERE date_time = $today_date
");
while (($row_e = $STH_e -> fetch_assoc()) !== null) { }
and I can display the results from this in the table_B.
The source tables for the first query and for the second query have only one common column - date_time.
What I must to do (and how) to display events_A and events_B in one table (ORDER BY date_time ASC)? - and for future - how add events_C (f.ex. similar to events_B)?
// I know that after all I need to format the data so that they look similar and it can be displayed in one table.

Answer 1

I'm not clear from your question whether you want to join the results - that is, the information from both tables is related in that two records sharing a date_time should be the same event - or unrelated.
If it is the latter, you cannot combine them meaningfully; you effectively have two different schemas.
If the information in tables A and B refers to the same events, and the date_time is a unique key, then you can do the following:
SELECT * FROM events_A, events_B WHERE events_A.date_time=events_B.date_time;
... or the like.
I think, from the query you built in PHP, you're not very strong on the features of SQL and when you would want to use them. It might be worth reading something like this guide to get a better handle on what should be done in the database rather than in PHP code before proceeding.