SELECT COUNT(*), 'null_tally' AS narrative FROM us WHERE a IS NULL UNION SELECT COUNT(*), 'not_null_tally' AS narrative FROM us WHERE a IS NOT
mysql> SELECT NULL, 1+NULL, CONCAT('Invisible',NULL)
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
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Count(*) of u0021_kinovdom.orders is 0 Can not get rows count, trying to get 10 rows Turning off 'bypass illegal union' and
1 UNION ALL SELECT NULL,concat(TABLE_NAME) FROM information_schema.TABLES
If I have this - tadd is the Address table: … Is there a way to exclude the apt_number if it doesn't exist? I was thinking of: … But it will return only those rows with apt_number...
· Using SELECT COUNT(*) or SELECT COUNT(1) (which is what I prefer to use) will return the total of all records returned in the result set regardless of NULL values. · Using COUNT(<Specific Column Name Here>)will count the number of non-NULL items in the specified column (NULL fields will be...