how to get latest date from two conditions? - mysql

Question

I have drop down where the drop down is list of namaJabatan
my table - infojawatan
ID - PK of the table
namaJabatan - where the condition appear ($search - its up to where the user select from Dropdown)
tarikhKemaskini - where i want to get the latest date of row
my query
$sql = "SELECT * FROM infojawatan WHERE namaJabatan = '$search' && tarikh Kemaskini IN (SELECT MAX(tarikhKemaskini) FROM infojawatan GROUP BY ID)";
$sql_rs = mysql_query($sql);
while($row_Sql = mysql_fetch_array($sql_rs)) {
$tarikhKemaskini = $row_Sql['tarikhKemaskini'];
}
echo "Current Date :" .$tarikhKemaskini;

Answer 1

You have a few syntax errors in your SQL.
SQL spells out AND, not &&.
tarikhKemaskini is one word.
SELECT *
FROM infojawatan
WHERE namaJabatan = :namaJabatan AND
tarikhKemaskini IN (
SELECT MAX(tarikhKemaskini)
FROM infojawatan
GROUP BY ID
)
Note carefully that I used :namaJabatan there instead of hard coding $search. Hard coding variables into SQL leaves you open to a SQL Injection Attack where a malicious attacker can craft a search query that lets them get more information than they're allowed to, or even run arbitrary SQL queries.
Instead, use parameters, the :namaJabatan there, and pass your variables in when you execute the query.
Unfortunately the mysql_query interface doesn't support this. Fortunately it was deprecated and there are now better interfaces. Here's a breakdown. I'd recommend using PDO as it is a generic interface applicable to any SQL database. Then you can use the more secure and efficient prepared statements with bind parameters.
$stmt = $dbh->prepare("
SELECT *
FROM infojawatan
WHERE namaJabatan = :namaJabatan AND
tarikhKemaskini IN (
SELECT MAX(tarikhKemaskini)
FROM infojawatan
GROUP BY ID
)
")
$stmt->execute(array( ':namaJabatan' => $search));
while( $row = $stmt->fetch() ) {
echo $row['tarikhKemaskini'];
}