Combine two columns into one column in SQL and add it to existing table

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How to merge or combine columns into one in SQL is shown
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Clear cut explanation, need more videos like this

vvkreddy
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Concatenation will not take effect for new rows. How to alter table to apply concatenate two column values for new rows as well?

alexanderfeldman
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how to change the position of newcolumn??? like what to do for the newcolumn to be in between name and salary??

Harikrishnan-nkjp
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How would you do this but columns from different tables into 1 column

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