procedures - How to get previous row data by using SQL? -

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here table example

main_cd code
1 aa

1 bb

1 cc

2 1231

2 1232

.

that table have lots of data. use main_cd "1" (other data other pages cannot delete it)

my question if got value of "cc". want sent pre_data ("aa") , next data ("cc")

also if got value of "cc", pre_data "bb" , next_data "aa"


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