{"id":1303,"date":"2018-08-06T09:42:42","date_gmt":"2018-08-06T09:42:42","guid":{"rendered":"http:\/\/dbtut.com\/?p=1303"},"modified":"2018-11-09T13:33:20","modified_gmt":"2018-11-09T13:33:20","slug":"mysql-the-datetime-column-rounding-causes-data-inconsistency","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/08\/06\/mysql-the-datetime-column-rounding-causes-data-inconsistency\/","title":{"rendered":"MySQL &#8212; The DATETIME column rounding causes data inconsistency"},"content":{"rendered":"<h2><\/h2>\n<h2>Description:<\/h2>\n<p>Recently, when i checked my data on two MySQL servers( version: 5.7.17 ), i found data differences between to servers, which surprised me. Because i inserted some datetime values into them( or i think ), then i supposed maybe it&#8217;s the rounding on a DATETIME column.<\/p>\n<p>First of all, check the audit log, it&#8217;s actually different of these two INSERTs, &#8216;2018-07-27 10:59:59.000&#8217; and\u00a0&#8216;2018-07-27 10:59:59.881&#8217;, and the column definition is not allowed the fractional seconds.\u00a0So it was rounding caused the difference.<\/p>\n<p>Read the Reference Manual( <a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/fractional-seconds.html\">https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/fractional-seconds.html<\/a> ) :<\/p>\n<p><b>MySQL 5.6.4 and up expands fractional seconds support for\u00a0<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/time.html\" target=\"_blank\" rel=\"nofollow noopener\">TIME<\/a>,\u00a0<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/datetime.html\" target=\"_blank\" rel=\"nofollow noopener\">DATETIME<\/a>, and\u00a0<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/datetime.html\" target=\"_blank\" rel=\"nofollow noopener\">TIMESTAMP<\/a>\u00a0values, with up to microseconds (6 digits) precision:<\/b><\/p>\n<p>So my MySQL server version is support\u00a0microseconds precision.<\/p>\n<p><b>Inserting a\u00a0<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/time.html\" target=\"_blank\" rel=\"nofollow noopener\">TIME<\/a>,<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/datetime.html\" target=\"_blank\" rel=\"nofollow noopener\">DATE<\/a>, or\u00a0<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/datetime.html\" target=\"_blank\" rel=\"nofollow noopener\">TIMESTAMP<\/a>\u00a0value with a fractional seconds part into a column of the same type but having fewer fractional digits results in rounding, as shown in this example:<\/b><\/p>\n<blockquote>\n<pre class=\"lang:default decode:true \">mysql&gt; CREATE TABLE fractest( c1 TIME(2), c2 DATETIME(2), c3 TIMESTAMP(2) );\r\n\r\nQuery OK, 0 rows affected (0.33 sec)\r\n\r\nmysql&gt; INSERT INTO fractest VALUES\r\n\r\n\u00a0 \u00a0 &gt; ('17:51:04.777', '2014-09-08 17:51:04.777', '2014-09-08 17:51:04.777');\r\n\r\nQuery OK, 1 row affected (0.03 sec)\r\n\r\nmysql&gt; SELECT * FROM fractest;\r\n\r\n+-------------+------------------------+------------------------+\r\n\r\n| c1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 | c2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 | c3\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n+-------------+------------------------+------------------------+\r\n\r\n| 17:51:04.78 | 2014-09-08 17:51:04.78 | 2014-09-08 17:51:04.78 |\r\n\r\n+-------------+------------------------+------------------------+\r\n\r\n1 row in set (0.00 sec)<\/pre>\n<p>&nbsp;<\/p><\/blockquote>\n<p><b>No warning or error is given when such rounding occurs. This behavior follows the SQL standard, and is not affected by the server&#8217;s\u00a0<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/server-system-variables.html#sysvar_sql_mode\" target=\"_blank\" rel=\"nofollow noopener\">sql_mode<\/a>\u00a0setting.<\/b><\/p>\n<p>So, everything is illuminated. I inserted a two different values( just millisecond value is not the same, and this value is not useless for me, i just need the DATETIME value is accurate to the second.\u00a0). But the ROUNDING to the second made the value changed.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>How to fix:<\/strong><\/h2>\n<p>Try to cut off the\u00a0millisecond value while inserting.<\/p>\n<p>Allowing the millisecond value storing,<\/p>\n<p>For example:<\/p>\n<pre class=\"lang:default decode:true\">\u00a0CREATE TABLE fractest( c1 DATETIME(3) );<\/pre>\n<p><i>which allows 3\u00a0fractional digits.<\/i><\/p>\n\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1303\" class=\"pvc_stats all  \" data-element-id=\"1303\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Description: Recently, when i checked my data on two MySQL servers( version: 5.7.17 ), i found data differences between to servers, which surprised me. Because i inserted some datetime values into them( or i think ), then i supposed maybe it&#8217;s the rounding on a DATETIME column. First of all, check the audit log, it&#8217;s &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1303\" class=\"pvc_stats all  \" data-element-id=\"1303\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":50,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[7],"tags":[1339,1340],"class_list":["post-1303","post","type-post","status-publish","format-standard","","category-mysql","tag-data-inconsistency","tag-rounding"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":532,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MySQL - The DATETIME column rounding causes data inconsistency - Database Tutorials Rounding on a DATETIME column<\/title>\n<meta name=\"description\" content=\"This article introduces the MySQL server rounds data while inserting a\u00a0TIME,DATE, or\u00a0TIMESTAMP\u00a0value with a fractional seconds part into a column of the same type but having fewer fractional digits.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbtut.com\/index.php\/2018\/08\/06\/mysql-the-datetime-column-rounding-causes-data-inconsistency\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL - The DATETIME column rounding causes data inconsistency - Database Tutorials Rounding on a DATETIME column\" \/>\n<meta property=\"og:description\" content=\"This article introduces the MySQL server rounds data while inserting a\u00a0TIME,DATE, or\u00a0TIMESTAMP\u00a0value with a fractional seconds part into a column of the same type but having fewer fractional digits.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dbtut.com\/index.php\/2018\/08\/06\/mysql-the-datetime-column-rounding-causes-data-inconsistency\/\" \/>\n<meta property=\"og:site_name\" content=\"Database Tutorials\" \/>\n<meta property=\"article:published_time\" content=\"2018-08-06T09:42:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-11-09T13:33:20+00:00\" \/>\n<meta name=\"author\" content=\"Shuo Wang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Shuo Wang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/08\/06\/mysql-the-datetime-column-rounding-causes-data-inconsistency\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/08\/06\/mysql-the-datetime-column-rounding-causes-data-inconsistency\/\"},\"author\":{\"name\":\"Shuo Wang\",\"@id\":\"https:\/\/dbtut.com\/#\/schema\/person\/83d7028b846c78bfd03244ec6cd04289\"},\"headline\":\"MySQL &#8212; 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