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Merged
dfreniche merged 1 commit into from
Apr 14, 2026
Merged

Added limit count sort and array examples #2

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101 changes: 99 additions & 2 deletions javascript/100_aggregation_pipeline_match.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -222,6 +222,103 @@
" });"
]
},
{
"cell_type": "markdown",
"id": "fc634597",
"metadata": {},
"source": [
"# Limit and Count documents\n",
"\n",
"## Show only 5 books"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "6aae4ffc",
"metadata": {},
"outputs": [],
"source": [
"const showOnly5Books = { $limit: 5 };\n",
"const projection = { $project: \n",
" {\n",
" _id: 0,\n",
" title: 1,\n",
" theAuthors: \"$authors.name\", // we're adding this field to show the authors' names using a expression\n",
" genres: 1\n",
" }\n",
"};\n",
"\n",
"const pipeline = [showOnly5Books, projection];\n",
"\n",
"const cursor = await books.aggregate(pipeline);\n",
"\n",
"await cursor.forEach((b) => {\n",
" console.log(b);\n",
"});\n"
]
},
{
"cell_type": "markdown",
"id": "1546e8b9",
"metadata": {},
"source": [
"## Count all books"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "3212e91f",
"metadata": {},
"outputs": [],
"source": [
"const countBooks = { $count: \"totalBooks\" };\n",
"\n",
"const pipeline = [countBooks];\n",
"\n",
"const cursor = await books.aggregate(pipeline);\n",
"\n",
"await cursor.forEach((b) => {\n",
" console.log(b);\n",
"});"
]
},
{
"cell_type": "markdown",
"id": "1ccf064b",
"metadata": {},
"source": [
"## Sorting"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "f080a8ef",
"metadata": {},
"outputs": [],
"source": [
"const showOnly5Books = { $limit: 5 };\n",
"const projection = { $project: \n",
" {\n",
" _id: 0,\n",
" title: 1,\n",
" theAuthors: \"$authors.name\", // we're adding this field to show the authors' names using a expression\n",
" genres: 1\n",
" }\n",
"};\n",
"const sortByName = { $sort: { title: 1 } };\n",
"\n",
"const pipeline = [showOnly5Books, projection, sortByName];\n",
"\n",
"const cursor = await books.aggregate(pipeline);\n",
"\n",
"await cursor.forEach((b) => {\n",
" console.log(b);\n",
"});\n"
]
},
{
"cell_type": "markdown",
"id": "f5ca6684",
Expand All @@ -237,7 +334,7 @@
"source": [
"### Find books with more than 2 available copies.\n",
"\n",
"[Solution here](https://mongodb-developer.github.io/sql-to-query-api-lab/docs/aggregation/match-project#-1-find-books-with-more-than-2-available-copies)"
"[Solution here](https://mongodb-developer.github.io/aggregation-pipeline-lab/docs/simple-queries/project#-1-find-books-with-more-than-2-available-copies)"
]
},
{
Expand All @@ -257,7 +354,7 @@
"source": [
"### Find books with more than 2 available copies. Return only book titles and publication year.\n",
"\n",
"[Solution here](https://mongodb-developer.github.io/sql-to-query-api-lab/docs/aggregation/match-project#-2-find-books-with-more-than-2-available-copies-return-only-book-titles-and-publication-year)"
"[Solution here](https://mongodb-developer.github.io/aggregation-pipeline-lab/docs/simple-queries/project#-2-find-books-with-more-than-2-available-copies-return-only-book-titles-and-publication-year)"
]
},
{
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60 changes: 60 additions & 0 deletions javascript/101_aggregation_pipeline_arrays.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,66 @@
" console.log(`book: ${JSON.stringify(doc)}`);\n",
"});"
]
},
{
"cell_type": "markdown",
"id": "b1b980a9",
"metadata": {},
"source": [
"## $elemMatch"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "fca82b33",
"metadata": {},
"outputs": [],
"source": [
"const result = await books.aggregate([\n",
" { $match: { attributes: { \n",
" $elemMatch: { key: \"edition\", value: \"1st\" } } } \n",
" },\n",
"]).toArray();\n",
"\n",
"result"
]
},
{
"cell_type": "markdown",
"id": "7dc0bb23",
"metadata": {},
"source": [
"## Get only the edition attribute"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "2c7b2b77",
"metadata": {},
"outputs": [],
"source": [
"const result = await books.aggregate([\n",
" { $match: { attributes: { \n",
" $elemMatch: { key: \"edition\", value: \"1st\" } } } \n",
" },\n",
" { $unwind : \"$attributes\" },\n",
" { $match: \n",
" {\"attributes.key\": \"msrp\", \n",
" \"attributes.value\": 9.99} \n",
" },\n",
" {\n",
" $project: {\n",
" title: 1,\n",
" attributes: 1\n",
" }\n",
" } \n",
" \n",
"]).toArray();\n",
"\n",
"result"
]
}
],
"metadata": {
Expand Down
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