How to use WHERE NOT EXISTS query to avoid duplicate entry using $wpdb to save in custom table?

WHERE NOT IN is what you need.

$sql = “INSERT INTO trip_rate (id, trip, rating, r_name, email, title, review)
SELECT ”, ‘$trip’, ‘$rating’, ‘$name’, ‘$email’, ‘$title’, ‘$review’
WHERE (trip_rate.email)
NOT IN (
SELECT email FROM trip_rate WHERE email=”$email” AND trip=’$trip’)”;

Related Posts:

  1. How to use $wpdb to delete in a custom table
  2. get_results on large datasets
  3. Is there a (better) way to access $wpdb results?
  4. Using $wpdb generates DB error
  5. How do you use prepare when asking for a list of id’s
  6. how to execute different sql query in non-sanitized $wpdb->get_results function
  7. WPDB update row with != in where clause
  8. How to update records using $wpdb?
  9. Need help writing a $wpdb query
  10. show badge with count for pending items in custom post type
  11. WP Sql query multiple where clause
  12. WordPress SQL query – returning ‘true’ ‘false’ or ‘null’
  13. Modify the structure of data returned by $wpdb
  14. Syntax for $wpdb->prepare when searching in two columns
  15. Confused by $wpdb->prepare
  16. How to display user_nicename and usermeta values by custom query in WordPress?
  17. Optimizing WordPress Queries – Removing Group By ID
  18. How can I combine one field using wpdb and group by?
  19. $wpdb->prepare with ON DUPLICATE KEY UPDATE
  20. how to use $wpdb->prepare to update a custom table
  21. WPDB Placeholders and second argument for prepared statements
  22. Increment integer field in database when WHERE needs to be dynamic [closed]
  23. Custom SQL query ORDER BY term_order
  24. Custom $wpdb returns unexpected time based results
  25. How to left join meta in queries [closed]
  26. wpdb->get_row is selecting the variable as a column name
  27. CREATE TABLE with dbDelta does not create table
  28. $wpdb query outputs php code instead of executing it
  29. wpdb query not working
  30. WordPress wpdb->insert returns int(0) => doesn’t insert anything, no errors!
  31. WPDB SQL Ignore `post_status` Parameter
  32. how to list all post that are in the custom taxonomy using $wpdb
  33. WPDB SQL query SELECT from category
  34. Creating an Angular factory from custom database table
  35. wpdb->update update the entire table instead of one row
  36. How do I update post based on meta_key in another table?
  37. How to set up prepared query using IN statement
  38. Custom database query to validate data
  39. Alter the main search query to search posts by coauthor user name
  40. Creates only one table and not the other
  41. Protect custom form from SQL injection
  42. looking for a way to allow users to backup the plugin db data(save as)
  43. SQL Query to select post title & post ID from a particular category
  44. Get comments after specific date
  45. query using wpdb in wordpress gets me no result
  46. Get count of rows based if column exists in two different tables
  47. query_vars doesn’t return query string (trying to get data from $wpdb)
  48. How do I check for a duplicate record before inserting using wpdb
  49. prepare() not working
  50. passing variables as parameters to stored procedures via wpdb from php-script
  51. $wpdb->query() multiple query support
  52. Set media metadata (i.e. “dimensions” field) on SVG file after extracting it with a filter
  53. $wpdb Query Result not coming but in phpmyadmin it works [closed]
  54. Join inside a wpdb query.. confused!
  55. How to query the WordPress database to get posts of a certain custom post type, taxonomy and field?
  56. Why doesn’t my insert query work?
  57. How to prevent $wpdb->prepare stripping a leading zero in variable value?
  58. Generate a unique hash/number for tracking on $wpdb insert
  59. wpdb->insert and stripslashes against sql injection
  60. $wpdb select query by month, post type, and taxonomy term
  61. WPDB – How to search a column in a table
  62. $wpdb not being defined in function: Fatal error: Call to a member function query() on a non-object
  63. How to obtain a reference to $table_prefix in $wpdb object
  64. Trying to Connect to different database
  65. How to pass orderby params to $wpdb->prepare()?
  66. Why does this WPDB code throw an empty WPDB error? [closed]
  67. wordpress $wpdb works only once
  68. get_results not returning anything
  69. WordPress core code contains things marked as deprecated by… WordPress?
  70. $wpdb – joining shows no result
  71. Compare transient data with a meta box value
  72. Sql formatting for post data within function
  73. How to get INSERT errors from $wpdb?
  74. Display category names on edit user profile using $wpdb
  75. Get unique results from this function
  76. prepare function sql safe method
  77. WPDB Table Does Not Exist
  78. Inserting a MySQL record into a table with an array of field names and an array of values
  79. Incorrect Use of wpdb::prepare()
  80. Ascending order of yearly archives [closed]
  81. $wpdb->get_results(…) with $wpdb->prepare(…) returns empty array despite correct query
  82. wpdb insert formatting for date in array
  83. Passing a SQL query to the WP Query
  84. Access to numerically indexed array in wpdb Class and undefined offset
  85. $wpbd->insert() does not insert user data
  86. Why $wpdb->insert and $wpdb->update not working server but it is working in localhost?
  87. wpdb prepare placeholders for MySQL keywords
  88. Sql query triggered twice
  89. Unable to insert data into using custom plugin
  90. Include post_status check within $wpdb query
  91. wpdb get_row database query inquiry
  92. Depreciated Call -> Function wpdb::escape()
  93. Inserting and updating rows with wpdb indreases integer fields by 1 point sometimes
  94. Retrieve a list of users based on some conditions
  95. wp_commentdata: error in documentation?
  96. wp-postratings: list current user’s unrated posts
  97. Error inserting row into table
  98. get only 1 wpdb and get taxonomy, post to next page [closed]
  99. $wpdb The query does not contain the correct number of placeholders
  100. $wpdb:insert, more arguements in $format array than in $data