If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate those columns.
SELECT CAST('abc' AS varchar(5)) COLLATE French_CS_AS. Truncating and rounding results. When converting character or binary expressions (binary, char, nchar, nvarchar, varbinary, or varchar) to an expression of a different data type, the conversion operation could truncate the output data...
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
...text=1' union+select+1,concat_ws(0x3a,table_name,column_name)
AS CHAR(N) casts the string to a nonbinary string and pads it on the right with spaces to a length of N characters. N must be at least 1. If N is less than the length of the input string, the string is truncated to N characters.
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SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both news table and members table
Return dimensions and metrics based on conditional expressions.CASE statements let you create new fields that use conditional logic to determine the field values.
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