For loop Join with &

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var substr = [1, 2, 3, 4, 5, 6];

for (var i = 0; i < substr.length; i++) {
    var urls = 'url' + substr[i];
    var joinArr = urls.join('&');
    console.log("JoinArray", joinArr);
}

Will join work to get output like this?

url1=&url2=&url3=&url4=&url5=&url6=

It's not a valid query string, but you could use map instead:

var joinArr = substr.map(n => "url" + n).join("=&") + "=";

SQL Server Nested Loop or Loop Join, The nested loop join, also called nested iteration, uses one join input as the outer input table (shown as the top input in the graphical execution� The Nested Loop Join gets a row from the outer table and searches for the row in the inner table; this process continues until all the output rows of the outer table are searched in the inner table. Nested Loop Join can be further categorized as Naive Nested Loop Join, Indexed Nested Loop Join and Temporary Index Nested Loop Join.

join is a method on arrays, but urls is a string, not an array.

You should push the string onto an array, and call join at the end.

And if you want them to have =, you need to concatenate that as well.

var substr = [1, 2, 3, 4, 5, 6];
var urls = [];
for (var i = 0; i < substr.length; i++) {
  urls.push('url' + substr[i] + '=');
}
var joinArr = urls.join('&');
console.log("JoinArray", joinArr);

When should I use an INNER -LOOP- JOIN instead of an INNER , LOOP | HASH | MERGE are Join hints, specifying that the join in the query should use looping, hashing, or merging. Using LOOP |HASH� Figure 1. Sample Execution Plan for Nested Loop Join. A nested loop join is particularly effective if the outer input is small and the inner input is sorted and large. In many small transactions, such as those affecting only a small set of rows, indexed nested loop joins are superior to both merge joins and hash joins. In large queries, however

You can join the index values and replace the numbers by the specific pattern.

var substr = [1, 2, 3, 4, 5, 6];
var str = substr.join('').replace(/[0-9]/g, (n) => `url${n}=&`).slice(0, -1);
console.log(str);

MySQL 5.7 Reference Manual :: 8.2.1.6 Nested-Loop Join , A simple nested-loop join (NLJ) algorithm reads rows from the first table in a loop one at a time, passing each row to a nested loop that processes the next table� Index join variation. If the inner relation has an index on the attributes used in the join, then the naive nest loop join can be replaced with an index join. algorithm index_join is for each tuple r in R do for each tuple s in S in the index lookup do yield tuple <r,s> The time complexity for this variation improves from O(M * N) to O(M * log N).

Since question is tagged jQuery, you can use $.param() on a reduced object

var substr = [1, 2, 3, 4, 5, 6];

var query = $.param(substr.reduce((a,c)=> (a['url' + c]='',a),{}))

console.log(query)
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

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What about...

var substr = [1, 2, 3, 4, 5, 6];
console.log('url'+substr.join('=&url')+'=');

//output:   url1=&url2=&url3=&url4=&url5=&url6=

?

Nested loop join, A nested loop join is a naive algorithm that joins two sets by using two nested loops. Join operations are important for database management. 3. The two-loop join. Work as for the finishing loop join (1b) to make a loop at the end of the current yarn. Then with the next yarn, make the starting loop (1a) passing it through the finishing loop to join the two yarns together. Equally, to connect the loops, you may interweave the yarn ends and make the loops.

Visualizing Nested Loops Joins in SQL Server, A look inside the SQL Server Nested Loops Join operator: how the algorithm works and what it Duration: 7:37 Posted: Dec 11, 2018 Using INNER LOOP JOIN and I just saw this message buried in the statistics IO output "Warning: The join order has been enforced because a local join hint is used.". So apparently when using INNER LOOP JOIN, the query optimizer enforces the nested loop join in the order specified in the FROM clause, which makes a big difference since these

Join Hints (Transact-SQL), LOOP cannot be specified together with RIGHT or FULL as a join type. For more information, see Joins. REMOTE Specifies that the join operation� Create your Loop Profile now! If you applied using The Common Application, you received an email with details on setting up your RIT Admissions Account. The Loop Invitation Email: After receiving your application, we also send an invitation to join the Loop with your account information and a temporary password.

Difference between Hash, Merge and Loop join?, From MSDN, in the topic of Advanced Query Tuning Concepts: SQL Server employs three types of join operations: Nested loops joins. Merge joins. Hash joins. It is a special gift to be able to connect to family and friends abroad in the touch of a few buttons on my Loop app. We regularly share photos of our kids, travels and pics of everyday life. It helps keep people feeling close and included.

Comments
  • join is an array operation. urls is a string, not an array.
  • One thing you can do is anytime your question is "Will this work?" is to actually run the code and see what it gives you.