Can’t run database query

Here issue with the column name. You are using column key in the query which is the default keyword/index in mysql.

For resolving this kind of issue just use the “Grave accent(`)’ symbol in the query for the column name, No need to change the column name. So in your case the right query is 

$details = $wpdb->get_results("SELECT * FROM " . $wpdb->prefix . "ch_guests WHERE `key` = '" . $id . "'", ARRAY_A);

Run the above query, This is working for me, so i believe will work for you as well.

Related Posts:

  1. How do you properly prepare a %LIKE% SQL statement?
  2. $wpdb and MySQL Create Trigger
  3. wpdb->prepare function remove single quote for %s in SQL statment
  4. Alternative to mysql_real_escape_string
  5. Increment value (value = value+1) of $wpdb->update
  6. wpdb Custom Meta Data with 2 conditions
  7. wpdb prepare syntax
  8. SQL query not working in alphabetical post title/content search
  9. MySQL LIKE not working
  10. Proper way to work with wpdb to get user’s firstname
  11. How to check for empty and not a failure
  12. Database: Custom table: sprintf value for DateTime column
  13. Converting mysql to $wpdb
  14. WP_USE_EXT_MYSQL
  15. wpdb insert and boolean fields
  16. Join new table with SQL query
  17. writing inner join in wpdb
  18. How to split the a table in database?
  19. MySQL Rank & $wpdb
  20. When WordPress Default table, Echo Success. When Plugin Table, Echo Blank
  21. How do I join a $wpdb query with user meta using default value if not exist?
  22. How to translate this mySQL query to $wpdb query
  23. $wpdb select all meta for each post
  24. $wpdb to insert html form information
  25. Proper usage of $wpdb->update()?
  26. WordPress(wpdb class) and mysql stored procedures
  27. Using WPDB->Insert()
  28. Active DB queries in WordPress?
  29. How to stop $wpdb from prepending database name
  30. WordPress $wpdb get posts from category and sort by custom meta
  31. How to get INSERT errors from $wpdb?
  32. Getting Error Trying to Create Table
  33. How to set MYSQLI_OPT_INT_AND_FLOAT_NATIVE option
  34. Understanding custom php that reads from WP MYSQL
  35. How to insert dash (-) into database using wpdb and new_to_publish hook?
  36. $wpdb->get_var multiple queries in one database check
  37. List users with the most posts in the last 30 days
  38. Insert two row in wordpress database
  39. WordPress $wpdb no result
  40. PHP variables in mysql query
  41. MySQL ‘duplicate entry’ error
  42. User set date and time from frontend doesn’t get stored into database
  43. Wpdb query with dynamic table name
  44. get posts whether meta_key exists or not
  45. when using $wpdb sudden connection rejection without changing anything. Access denied, with errors from repair tool
  46. How to search usermeta table
  47. How to add virtual column in wpdb get_result statement
  48. wpdb insert into point column in db
  49. WPDB delivers wrong results from complex queries
  50. $wpdb post type and term query only works when there are no dashes or spaces in the term slug and title
  51. CONCAT_WS in custom sql query
  52. Geographical proximity query using post_meta
  53. MySQL Select within WP Page template
  54. Saving custom term value to the database in new table
  55. why is $wpdb->update() causing a DB error from within wp_set_password()
  56. $wpdb->get_var returns 0
  57. Initialization of table in database using ‘CREATE … IF NOT EXISTS’
  58. Not unique table/alias
  59. Install mysql-python (Windows)
  60. Disable ONLY_FULL_GROUP_BY
  61. MySQL WHERE IN ()
  62. MySQL Error #1133 – Can’t find any matching row in the user table
  63. How can I prevent SQL injection in PHP?
  64. Best way to store an array in MySQL database?
  65. How to check if mysql database exists
  66. #1062 – Duplicate entry for key ‘PRIMARY’
  67. How can I convert a string to a float in mysql?
  68. Is there a Profiler equivalent for MySql?
  69. How to return number of found rows from SELECT query
  70. How to replace the domain name in a WordPress database?
  71. MySQL Replication Latency Issues in wp-admin pages
  72. How can I debug my database connection for unit testing?
  73. Importing MariaDB into Mysql in WordPress
  74. Get multiple custom field values in a $wpdb query [duplicate]
  75. How to get a Google maps SQL->XML->map marker tutorial to work in WordPress
  76. Update a WordPress post or page takes 60+ seconds
  77. WordPress get pagination on wpdb get_results
  78. Show MySQL errors that occur when I excute $wpdb->insert()
  79. Database query works fine outside WordPress
  80. $wpdb->prepare with LIKE and sprintf
  81. SQL syntax error when getting data for a url
  82. Placing a widget with $wpdb query
  83. How can I add a new row in a separate database when someone registers via WordPress?
  84. Get posts from category with custom query
  85. How to use mysql LIKE with wpdb?
  86. Best approach for a custom database filling in WP custom post types
  87. How to use AJAX in WordPress in MYSQL query?
  88. SQL statement using placeholder is not returning results
  89. Passing in MySQL prepare statement parameter separately throwing error
  90. “BS_” rows in postmeta table
  91. update multiple rows in mysqli table base on two values
  92. Not getting ajax success response on insert/update row to database
  93. How can I verify WordPress nonce from the following code?
  94. How to write in MySQL more characters in user_nicename
  95. What is the cron doing?
  96. SQL error on restoring database
  97. MySQL database gives blank page (white screen of death)
  98. Global MySQL replacing of text patterns/matches
  99. mysqldump throws: Unknown table ‘COLUMN_STATISTICS’ in information_schema (1109)
  100. How do I load a sql.gz file to my database? (importing)