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Delete the first three rows of a dataframe in pandas
... @M.K if using this approach, you can use this in combination with pd.concat(). Something like, df2 = pd.concat([df.iloc[:3],df.iloc[10:]]).
– bdiamante
Jun 26 '19 at 17:00
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MySQL search and replace some text in a field
...t to search and replace based on the value of another field you could do a CONCAT:
update table_name set `field_name` = replace(`field_name`,'YOUR_OLD_STRING',CONCAT('NEW_STRING',`OTHER_FIELD_VALUE`,'AFTER_IF_NEEDED'));
Just to have this one here so that others will find it at once.
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How to convert an int array to String with toString method in Java [duplicate]
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.mapToObj(String::valueOf)
.reduce((a, b) -> a.concat(",").concat(b))
.get();
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How to see indexes for a database or table in MySQL?
...ed database.
SELECT TABLE_NAME,
COUNT(1) index_count,
GROUP_CONCAT(DISTINCT(index_name) SEPARATOR ',\n ') indexes
FROM INFORMATION_SCHEMA.STATISTICS
WHERE TABLE_SCHEMA = 'mydb'
AND INDEX_NAME != 'primary'
GROUP BY TABLE_NAME
ORDER BY COUNT(1) DESC;
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How to get all columns' names for all the tables in MySQL?
...omma-delimited list of the columns in each table:
SELECT table_name,GROUP_CONCAT(column_name ORDER BY ordinal_position)
FROM information_schema.columns
WHERE table_schema = DATABASE()
GROUP BY table_name
ORDER BY table_name
Note : When using tables with a high number of columns and/or with long f...
JavaScript: How to join / combine two arrays to concatenate into one array? [duplicate]
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var a = ['a','b','c'];
var b = ['d','e','f'];
var c = a.concat(b); //c is now an an array with: ['a','b','c','d','e','f']
console.log( c[3] ); //c[3] will be 'd'
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Array_merge versus + [duplicate]
... instead using two new functions we wrote. "array_merge_by_key" and "array_concat" instead of a single function with a heuristic that tries to guess at what you want
– Yuliy
Jul 28 '14 at 0:38
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Prepend text to beginning of string
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Since we want to test prepend, and not just concatenate, I've updated the tests: jsperf.com/prepend-text-to-string/5
– metalim
Apr 22 '19 at 11:32
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const char* concatenation
I need to concatenate two const chars like these:
12 Answers
12
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Why .NET String is immutable? [duplicate]
... before StringBuilder becomes more efficient than the equivalent series of concatenations, with their inherent construction).
It would be a disadvantage if mutability was part of the purpose of an object (who'd want to be modeled by an Employee object whose salary could never ever change) though so...