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25 maj 2011 · Two options: Use the LIKE keyword, along with percent signs in the string. select * from table where field like '%a%' or field like '%b%'.
6 cze 2024 · We can use the function NULLIF to compare and check if the column contains null or empty values: SELECT id, name FROM Department WHERE NULLIF(TRIM(code), '') IS NULL; The NULLIF function evaluates its two arguments, returning NULL if they are equal.
2 lut 2024 · To determine if a column is empty or null in MySQL, we utilize the IS NULL and IS NOT NULL conditions in a SELECT statement. To ascertain if a column is empty or null in SQL, use COALESCE(column, ”) or column IS NULL OR column = ”. These queries fetch rows where the specified column contains an empty string or null value, ensuring ...
13 kwi 2016 · 1 Answer. Sorted by: 1. You can use and for this purpose: SELECT * FROM `TAB1` WHERE ISNULL(col1, '') = '' OR ISNULL(col2, '') = '' or. SELECT * FROM `TAB1` WHERE NULLIF(col1, '') IS NULL OR NULLIF(col2, '') IS NULL. Share. Improve this answer. answered Apr 14, 2016 at 1:29. Ezequiel Tolnay. 5,028 1 16 23. Add a comment. Post Your Answer.
The WHERE clause allows you to specify a search condition for the rows returned by a query. The following shows the syntax of the WHERE clause: SELECT . select_list. FROM . table_name. WHERE . search_condition; Code language: SQL (Structured Query Language) (sql)
26 sty 2024 · By understanding how to combine the WHERE, GROUP BY, and HAVING clauses in MySQL, you can create powerful, precise queries that return exactly the data you need. Remember to utilize them in the correct order and beware of the common pitfalls associated with their use.
23 mar 2023 · This article showed you how to locate a substring in a string in SQL using both MySQL and SQL Server. CHARINDEX() and PATINDEX() are the functions with which you can search for a substring in a string inside SQL Server. PATINDEX() is more powerful because it lets you use regular expressions.
