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22 cze 2013 · This means that: If your select returns one value, that value is returned. If your select statement returns one column, but no rows, NULL will be returned. If your select statement returns multiple columns and/or multiple rows, this won't work and the query fails. edited Sep 26 at 20:45.
18 lut 2009 · For DATE and DATETIME columns that are declared as NOT NULL, you can find the special date '0000-00-00' by using a statement like this: SELECT * FROM tbl_name WHERE date_column IS NULL. This is needed to get some ODBC applications to work because ODBC does not support a '0000-00-00' date value.
1 gru 2015 · Do have a look at mysql date/datetime formats, this will give you clear idea of how you should use date functions in mysql. If you need data of previous year, simply change your where condition to: YEAR(product.created_at) < YEAR(NOW())
2 lut 2024 · By carefully checking the code where your SQL query is formed and ensuring that the query string is not empty before execution, you can avoid the Error 1065. Implementing proper checks and debugging can help you quickly diagnose and fix issues related to empty queries in MySQL.
Simple "select" query gives wrong empty result depending on used index or even spacing between operators, and the only way to fix this - to run "analyze table". First time I got such behaviour on MySQL 5.6.27, then 28,29 and now on the current stable 5.7.11.
22 mar 2016 · I am trying to replace many null date values in a single column using this query: UPDATE animal SET. BirthDate = '1900-01-01 06:00:00 AM'. WHERE BirthDate = '''. MySQL shows this error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE animal SET ...
DATA, empty or missing columns are updated with ''. To load a NULL value into a column, use \N in the data file. The literal word NULL may also be used under some circumstances. See Section 15.2.9, “LOAD DATA Statement”. When using DISTINCT, GROUP. BY, or ORDER BY, all NULL values are regarded as equal.
