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Learn MySQL from scratch for Data Science and Analytics The IS NULL constraint can be used whenever the column is empty and the symbol ( ' ') is used when there is empty value. mysql> SELECT * FROM ColumnValueNullDemo WHERE ColumnName IS NULL OR ColumnName = ' '; After executing the above query, the output obtained is.
Whitespace is optional in pretty much any language where it is not absolutely necessary to preserve boundaries between keywords and/or identifiers. You could write code in C# that looked similar to your SQL, and as long as the compiler can still parse the identifiers and keywords, it doesn't care.
White space is a character in a string that represents horizontal or vertical space in typography. In other words: tabs, line feeds, carriage returns and, yes, spaces. A white space has character value, just like 'A', 'B' and 'C' have a value.
I've got some blank values in my table, and I can't seem to catch them in an IF statement.
I've tried
IF @value = '' and if @value = NULL and neither one catches the blank values. Is there any way to test whether or not a varchar is entirely whitespace?
AHA! Turns out I was testing for null wrong. Thanks.
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