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How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
...ARY KEY (id)
);
mysql> REPLACE INTO test VALUES (1, 'Old', '2014-08-20 18:47:00');
Query OK, 1 row affected (0.04 sec)
mysql> REPLACE INTO test VALUES (1, 'New', '2014-08-20 18:47:42');
Query OK, 2 rows affected (0.04 sec)
mysql> SELECT * FROM test;
+----+------+---------------------+
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How to delete (not cut) in Vim?
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M. Gruber
7188 bronze badges
answered Aug 16 '12 at 19:13
romainlromainl
147k1515 gold ba...
Switch case with fallthrough?
...his answer helpful.
– Tyson
Apr 23 '18 at 4:03
1
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Measure time in Linux - time vs clock vs getrusage vs clock_gettime vs gettimeofday vs timespec_get?
...ich is not very long for a 1 MHz clock). man clock says that since glibc 2.18 it is implemented with clock_gettime(CLOCK_PROCESS_CPUTIME_ID, ...) in Linux.
clock_gettime(CLOCK_MONOTONIC, ...) provides nanosecond resolution, is monotonic. I believe the 'seconds' and 'nanoseconds' are stored separate...
Python equivalent for PHP's implode?
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187
Use the strings join-method.
print ' '.join(['word1', 'word2', 'word3'])
You can join any i...
Rails detect if request was AJAX
...arAmir Raminfar
32k66 gold badges8383 silver badges118118 bronze badges
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jQuery: Adding two attributes via the .attr(); method
...o DOM.
– Akash Kava
Mar 21 '15 at 9:18
To set multiple attributes you need to wrap everything in { ... }... Don't the ...
Matplotlib Legends not working
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answered Jan 18 '15 at 11:19
ppaulojrppaulojr
3,44344 gold badges2525 silver badges5252 bronze badges
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Adding iOS UITableView HeaderView (not section header)
...tantiate...
– Charles Robertson
Nov 18 '16 at 0:01
1
It won't let me add a height constraint to t...
datetime.parse and making it work with a specific format
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edited May 16 '18 at 12:41
S. Baggy
86599 silver badges2020 bronze badges
answered Dec 4 '08 ...