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Show all rows in mysql table then give option to delete specific ones

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问题 I want to have the ability to show all the entries in a database table and by each one give the user the ability to delete specific ones. I am currently using a for each loop that loops through the database showcasing each entry. $result = mysql_query("SELECT * FROM KeepScores"); $fields_num = mysql_num_fields($result); echo "<table><tr>"; // printing table headers echo "<td>Recent Posts</td>"; echo "</tr>\n"; // printing table rows while($row = mysql_fetch_row($result)) { echo "<tr>"; //

Delete rows that exist in another data frame?

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问题 I have the two following data frames (example): df1: name profile type strand A 4.5 1 + B 3.2 1 + C 5.5 1 + D 14.0 1 - E 45.1 1 - F 32.8 1 - G 19.9 1 + df2: name A B C G I would like to delete the rows in df1 for which df1$name = df2$name to get the following: Output: name profile type strand D 14.0 1 - E 45.1 1 - F 32.8 1 - If anyone could tell me which piece of code to use it would be a lot of help, seemed simple at first but I've been messing it up since yesterday. 回答1: You need the %in%

Find max value and show corresponding value from different field in MS Access

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问题 So I found this similar question and answer at (Find max value and show corresponding value from different field in SQL server) but I want to take it one step further. I want to get the latest date for each ID and the corresponding TYPE instead of just the absolute max for all entries. Any suggestions? ID Type Date 1 Initial 1/5/15 1 Periodic 3/5/15 2 Initial 2/5/15 3 Initial 1/10/15 3 Periodic 3/6/15 4 Initial 3/8/15 The code below shows how to get just the max date of ALL entries, but I

PHP MySQL delete row

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问题 I have searched everywhere and cannot find the answer, I believe I have the correct code but there could be a typo. What is going wrong here? I have the link that posts the product id correctly to the url as shown: userAccount.php : while($columnDelete = mysqli_fetch_array($query, MYSQLI_ASSOC)){ echo "<section class='product'> <a href='extras/deleteProcess.php?productId=".$columnDelete['productId']."' class='deleteProduct' style='color:#990000;font-family:arial;font-weight:bold;font-size

Delete rows that exist in another data frame?

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I have the two following data frames (example): df1: name profile type strand A 4.5 1 + B 3.2 1 + C 5.5 1 + D 14.0 1 - E 45.1 1 - F 32.8 1 - G 19.9 1 + df2: name A B C G I would like to delete the rows in df1 for which df1$name = df2$name to get the following: Output: name profile type strand D 14.0 1 - E 45.1 1 - F 32.8 1 - If anyone could tell me which piece of code to use it would be a lot of help, seemed simple at first but I've been messing it up since yesterday. You need the %in% operator. So, df1[!(df1$name %in% df2$name),] should give you what you want. df1$name %in% df2$name tests

Deleting Row in SQLite in Android

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问题 This might be a dumb question, but I\'m new to SQLite and I can\'t seem to figure this out. I have 1 table that has columns KEY_ROWID , KEY_NAME , KAY_LATITUDE , and KEY_LONGITUDE . I want the user to be able to select one and delete it; Can anyone give me a direction to start in? My question is in the actual deletion of the row given only its name. Relevant code: public class BeaconDatabase { public static final String KEY_ROWID = \"_id\"; public static final String KEY_NAME = \"beacon_name\