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How to create article tables, categories and tags?
How does database indexing work?How can I prevent SQL injection in PHP?Add a column with a default value to an existing table in SQL ServerInsert results of a stored procedure into a temporary tableHow do I UPDATE from a SELECT in SQL Server?Finding duplicate values in a SQL tablesql select query for one row in one table and multiple row from another tableSelect posts and tags in a single queryHow to import an SQL file using the command line in MySQL?How to join three table by laravel eloquent model
I do not know how correctly integrate all these tables in 2nf SQL. I have some tables. They look like this:
posts:
id, title
categories:
id, name
tags:
id, name
I would like to have one table post-category-tag, with fields:
(id, post_id, category_id, tag_id). Not sure if this is correct, since the article may have a large number of tags. Show me please how to create this table correctly.
mysql sql
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
add a comment |
I do not know how correctly integrate all these tables in 2nf SQL. I have some tables. They look like this:
posts:
id, title
categories:
id, name
tags:
id, name
I would like to have one table post-category-tag, with fields:
(id, post_id, category_id, tag_id). Not sure if this is correct, since the article may have a large number of tags. Show me please how to create this table correctly.
mysql sql
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
post-category-tag, with fields: (id, post_id, category_id, tag_id)looks like 3nf. What stops you applying this?
– Derviş Kayımbaşıoğlu
Mar 8 at 7:09
@Simonare Can you show me how some fields look like?
– Alex Smirnov
Mar 8 at 7:14
Actually, if a post can belong to more than one category, then I would expect there to be a table of post_categories, otherwise I would expect category_id to be a column in posts. Then I would expect there to be another table: post_tags, with no mention of categories in it. Note that there are no 'articles' here.
– Strawberry
Mar 8 at 8:21
@Strawberry Is it right? post_category (id, post_id, category_id), post_tags(id, post_id, tag_id).
– Alex Smirnov
Mar 8 at 10:32
It depends on your requirements, but looks plausible to me. And, as mentioned, the surrogate key may not be necessary if the remaining columns serve to uniquely identify each row (a natural composite key).
– Strawberry
Mar 8 at 10:34
add a comment |
I do not know how correctly integrate all these tables in 2nf SQL. I have some tables. They look like this:
posts:
id, title
categories:
id, name
tags:
id, name
I would like to have one table post-category-tag, with fields:
(id, post_id, category_id, tag_id). Not sure if this is correct, since the article may have a large number of tags. Show me please how to create this table correctly.
mysql sql
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
I do not know how correctly integrate all these tables in 2nf SQL. I have some tables. They look like this:
posts:
id, title
categories:
id, name
tags:
id, name
I would like to have one table post-category-tag, with fields:
(id, post_id, category_id, tag_id). Not sure if this is correct, since the article may have a large number of tags. Show me please how to create this table correctly.
mysql sql
mysql sql
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
edited Mar 8 at 7:05
Alex Smirnov
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
asked Mar 8 at 6:49
Alex SmirnovAlex Smirnov
13
13
post-category-tag, with fields: (id, post_id, category_id, tag_id)looks like 3nf. What stops you applying this?
– Derviş Kayımbaşıoğlu
Mar 8 at 7:09
@Simonare Can you show me how some fields look like?
– Alex Smirnov
Mar 8 at 7:14
Actually, if a post can belong to more than one category, then I would expect there to be a table of post_categories, otherwise I would expect category_id to be a column in posts. Then I would expect there to be another table: post_tags, with no mention of categories in it. Note that there are no 'articles' here.
– Strawberry
Mar 8 at 8:21
@Strawberry Is it right? post_category (id, post_id, category_id), post_tags(id, post_id, tag_id).
– Alex Smirnov
Mar 8 at 10:32
It depends on your requirements, but looks plausible to me. And, as mentioned, the surrogate key may not be necessary if the remaining columns serve to uniquely identify each row (a natural composite key).
– Strawberry
Mar 8 at 10:34
add a comment |
post-category-tag, with fields: (id, post_id, category_id, tag_id)looks like 3nf. What stops you applying this?
– Derviş Kayımbaşıoğlu
Mar 8 at 7:09
@Simonare Can you show me how some fields look like?
– Alex Smirnov
Mar 8 at 7:14
Actually, if a post can belong to more than one category, then I would expect there to be a table of post_categories, otherwise I would expect category_id to be a column in posts. Then I would expect there to be another table: post_tags, with no mention of categories in it. Note that there are no 'articles' here.
– Strawberry
Mar 8 at 8:21
@Strawberry Is it right? post_category (id, post_id, category_id), post_tags(id, post_id, tag_id).
– Alex Smirnov
Mar 8 at 10:32
It depends on your requirements, but looks plausible to me. And, as mentioned, the surrogate key may not be necessary if the remaining columns serve to uniquely identify each row (a natural composite key).
– Strawberry
Mar 8 at 10:34
post-category-tag, with fields: (id, post_id, category_id, tag_id) looks like 3nf. What stops you applying this?– Derviş Kayımbaşıoğlu
Mar 8 at 7:09
post-category-tag, with fields: (id, post_id, category_id, tag_id) looks like 3nf. What stops you applying this?– Derviş Kayımbaşıoğlu
Mar 8 at 7:09
@Simonare Can you show me how some fields look like?
– Alex Smirnov
Mar 8 at 7:14
@Simonare Can you show me how some fields look like?
– Alex Smirnov
Mar 8 at 7:14
Actually, if a post can belong to more than one category, then I would expect there to be a table of post_categories, otherwise I would expect category_id to be a column in posts. Then I would expect there to be another table: post_tags, with no mention of categories in it. Note that there are no 'articles' here.
– Strawberry
Mar 8 at 8:21
Actually, if a post can belong to more than one category, then I would expect there to be a table of post_categories, otherwise I would expect category_id to be a column in posts. Then I would expect there to be another table: post_tags, with no mention of categories in it. Note that there are no 'articles' here.
– Strawberry
Mar 8 at 8:21
@Strawberry Is it right? post_category (id, post_id, category_id), post_tags(id, post_id, tag_id).
– Alex Smirnov
Mar 8 at 10:32
@Strawberry Is it right? post_category (id, post_id, category_id), post_tags(id, post_id, tag_id).
– Alex Smirnov
Mar 8 at 10:32
It depends on your requirements, but looks plausible to me. And, as mentioned, the surrogate key may not be necessary if the remaining columns serve to uniquely identify each row (a natural composite key).
– Strawberry
Mar 8 at 10:34
It depends on your requirements, but looks plausible to me. And, as mentioned, the surrogate key may not be necessary if the remaining columns serve to uniquely identify each row (a natural composite key).
– Strawberry
Mar 8 at 10:34
add a comment |
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post-category-tag, with fields: (id, post_id, category_id, tag_id)looks like 3nf. What stops you applying this?– Derviş Kayımbaşıoğlu
Mar 8 at 7:09
@Simonare Can you show me how some fields look like?
– Alex Smirnov
Mar 8 at 7:14
Actually, if a post can belong to more than one category, then I would expect there to be a table of post_categories, otherwise I would expect category_id to be a column in posts. Then I would expect there to be another table: post_tags, with no mention of categories in it. Note that there are no 'articles' here.
– Strawberry
Mar 8 at 8:21
@Strawberry Is it right? post_category (id, post_id, category_id), post_tags(id, post_id, tag_id).
– Alex Smirnov
Mar 8 at 10:32
It depends on your requirements, but looks plausible to me. And, as mentioned, the surrogate key may not be necessary if the remaining columns serve to uniquely identify each row (a natural composite key).
– Strawberry
Mar 8 at 10:34