A LEFT JOIN in SQL returns all records from the left table (the first table specified in the query) and the matched records from the right table. If there is no match, the result will contain NULL values in columns from the right table. This join type is particularly useful in scenarios where you need to keep all data from the primary table, even if corresponding records do not exist in the related table. It is commonly used when performing analyses requiring comprehensive data from one table while optionally pulling related data from another. The other options are incorrect because: • Option 1 (INNER JOIN) only returns rows with matching values in both tables. • Option 3 (RIGHT JOIN) returns all rows from the right table, not the left. • Option 4 (FULL JOIN) includes all matching and non-matching rows from both tables. • Option 5 (CROSS JOIN) returns the Cartesian product without any filtering on matching keys.
Read the following statement and answer the following question.
A @ B means AB is the mother of
A # B, which means AB is father.
A ...
During lunch break, eight colleagues, namely A, B, C, D, E, F, G and H are sitting in a circle facing the centre at equal distances. B is an immediate n...
Select the connect mirror image from the following options, when the mirror is placed on the right side of the given figure.
Select the word-pair that best represents a similar relationship to the one expressed in the given pair of words.
(The words must be considered a...
Select the option that represents the correct order of the given words as they would appear in an English dictionary.
1. Meconium
2. Medic...
If ‘+’ means ‘–’, ‘–’ means ‘×’, ‘×’ means ‘÷’, ‘÷’ means ‘+’, then what will come in place of the question mark...
Select the set in which the numbers are related in the same way as are the numbers of the given sets.
(NOTE : Operations should be performed on t...
Which two signs should be interchanged to make the given equation correct?
13 + 145 ÷ 29 × 52 – 11 = 106
Each of P, Q, R, S, T, U and V has exam on different day of the same week starting from Monday and ending on Sunday. R's exam is immediately before U's ...
Select the option that correctly fills in the blank and completes the series.
ay, cw, eu, gs, iq, ko, ______