Should wp_postmeta meta_key always be unique for a given post_id?

Should wp_postmeta meta_key always be unique for a given post_id?

Related Posts:

  1. Query all posts where a meta key does not exist
  2. what is the correct way to compare dates in a WP query_posts meta_query
  3. Get post with multiple meta keys and value
  4. Admin Area Custom Type Search By Meta Fields Without Title & Content
  5. Echo all meta keys of a custom-post TYPE
  6. How can I filter posts by post_parent in the admin?
  7. Post metadata deletes itself
  8. How to create a mini directory in WordPress?
  9. Detect meta value changes when post is updated (post_updated)
  10. Search everything (posts, pages, tags, cpt, meta)
  11. Custom Post Type: Set post_title equal to a custom post type field
  12. I can’t set meta_key in my custom post type query
  13. Compare 3 custom fields and sort by oldest
  14. Can’t sort order of wp_query with 2 meta keys
  15. How to get source of custom meta image?
  16. How can I include meta box content when searching?
  17. update a post meta from a single table cell TablePress
  18. Custom Meta Boxes – Nonce Issue – Move to trash issue
  19. Displaying Meta Box Image
  20. Automatically adding meta data to posts or multiple query help
  21. Trigger “unsaved changes” dialog for custom post meta changes
  22. Conditionally Query Custom Post Types by Post Meta for Blog Home Page?
  23. Displaying custom posts only if custom meta box’s date is not expired
  24. Displaying Metabox value (custom post type taxonomy)
  25. How do I sort a custom post type admin column using two meta keys?
  26. How can I display my custom metaboxes on a custom post template?
  27. get_post_meta is returning image id
  28. Custom Post Type, Saving Multiple Checkboxes
  29. Create a random unique 6 digit number as custom field for custom post type
  30. Export entries and multiple custom field meta to .csv?
  31. how to interconnect custom post types?
  32. Metadata for a taxonomy – is there any WordPress way of doing this?
  33. orderby in custom WP Query does not work
  34. Update CPT post meta with update_post_meta and cron job
  35. Insert post metadata for all posts in CPT at once if metadata no existent
  36. Display custom post type from dynamic custom field
  37. Populate dropdown from one custom post type inside another custom post type
  38. Notice: Undefined index: error and understanding wordpress
  39. Custom Post Types. Are there any disadvantages/advantages in using a plugin to develop them?
  40. Get posts between custom dates
  41. Deleting Custom Posts & Meta Data on Uninstall
  42. How do I create an archive page as a including metadata?
  43. A better way to add a meta box to custom post types
  44. Two Custom Post Types Many to Many Relationship
  45. post meta parameter in post custom-post-type endpoint with restapi
  46. How do I set all of a particular post meta to a value within the custom post type I’m in?
  47. Custom fields (wp_post_meta) vs Custom Table for large amount of data
  48. Storing a many to many post type relationship in post meta and keeping SQL ability for Joins
  49. Custom filter function not working with Custom post type
  50. Getting thumbnails of a custom posts featured images in a page-templates metabox
  51. Remove Post Custom Meta Box
  52. Using preg_replace to filter custom textarea
  53. If Post Meta Equals Current Title Conditional Advanced Custom Fields
  54. Meta data (Tags and Categories) for Custom Posts not showing.
  55. Display different information of a custom post type
  56. delete_post_meta() for whole CPT / multiple posts?
  57. How to get specific post meta by title or id
  58. How can I display a drop-down select of Post Names
  59. how to show records that don’t have custom meta value
  60. $post->post_meta not pulling any post in wordpress/php
  61. WP_Query of custom post type sorted by meta_key has unexpected results
  62. Get all metadata for a given custom post type
  63. Advanced custom field – posted fields from custom post type
  64. delete duplicate meta_value with same post_id
  65. Search CPT Title AND Meta
  66. Add a class to post_class if more than one post shares same meta_value_num
  67. Function to return values from metabox
  68. Add a meta field to the list of results for a custom post type
  69. Filter search posts by post meta?
  70. Custom fields for post or terms which don’t update on post update
  71. Using publish_{custom-post-type} hook for custom post type to update meta doesn’t work
  72. Add a form in every post and save data in post meta
  73. How to use multiple Meta Field from CPT as Post permalink
  74. Unable to gather Image URL from Custom Post Type’s; Custom Meta Field
  75. Attaching more than 1 parent (Post) to a media file
  76. How can I add a meta[] to my custom post type and search by term with the Rest API?
  77. Creating an archive page or simple template to list all values of a custom field of specific post type listing
  78. Custom meta fields not showing up in WP_Response Object via custom endpoint
  79. How to get post by meta value
  80. Get meta values from parent post and save in child post
  81. How do I get all authors posts of a custom post type outside loop
  82. How to Disable option of meta field if that option is selected for any other post in custom post type?
  83. How to get post detail based on URL of the post
  84. Custom post type meta fields missing on save_post_type
  85. Linking posts together with Advanced Custom Fields “both ways”
  86. Order posts by meta value hiding posts instead of re-ordering
  87. custom search results – order results differently by post type
  88. How to get Current week and current date record wp query
  89. get_post_meta for Custom Post Type ( CPT )
  90. Complex strcuture as CPT or taxonomy for use in woocommerce product variations [closed]
  91. How to add post reference field to a plugin?
  92. Custom Post Type meta oembed html output resulting in WSoD
  93. Add auto increment value to custom meta
  94. Random meta field from specific custom post type
  95. Custom Form Data save after Login User
  96. Changing to different post type maintains the redirection?
  97. Post Meta for Custom Post Types
  98. How do I add the “orange counter” next to a Custom Post Type?
  99. CPT meta values intermittently return empty
  100. Quering a post object based on another related post object