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You need to change date type to CHAR using CAST function like. CONCAT(CAST(`date_from` AS CHAR),' - ',CAST(`date_to` AS CHAR)) AS `period`
Definition and Usage. The CONCAT () function adds two or more expressions together. Note: Also look at the CONCAT_WS () function. Syntax. CONCAT (expression1, expression2, expression3,...) Parameter Values. Technical Details. Works in: From MySQL 4.0. More Examples. Example. Add three columns into one "Address" column:
26 sty 2024 · The CONCAT function in MySQL is a string function that allows you to join two or more strings together. This can be incredibly useful when working with database tables where you need to combine information from different columns or add a certain format to the data you retrieve.
Use the MySQL CONCAT() function to concatenate multiple strings into a single string. The CONCAT() function returns NULL if any string argument is NULL.
30 maj 2021 · SELECT CONCAT('Today is the ',dayofyear(current_date()),ending(dayofyear(current_date())) ,' day of the year, the ', weekofyear(current_date()),ending(weekofyear(current_date())) ,' week of the year and the ',dayofweek(current_date()),ending(dayofweek(current_date())),' day of the week.')
For quoted strings, concatenation can be performed by placing the strings next to each other: mysql> SELECT 'My' 'S' 'QL'; -> 'MySQL' If CONCAT() is invoked from within the mysql client, binary string results display using hexadecimal notation, depending on the value of the --binary-as-hex.
10 lip 2024 · The CONCAT() function in MySQL is a versatile tool used for string concatenation. It allows you to combine two or more strings into a single string. This function is especially useful for data formatting, combining fields, and creating readable outputs from data.
