Deleting data from another table with multiple conditions

Hi frnds
I need to delete some data from a table based on multiple condition I tried following sql but its deleteing some rows which is not meeting the criteria which is really dangerours. When i trying = operator it returns ORa- 01427 single -row subquery returns more than one row
delete from GL_TXNS
where TRN_DT in (Select trn_Dt from GL_MAT)
and BR in (select ac_branch from GL_MAT)
and CODE in (select CODE T from GL_MAT)
and (lcy_amt in (select lcy_amt from GL_MAT) or
fcy_amt in(select fcy_amt from GL_MAT)
rgds
ramya

My answer is the same as Avinash's but I will explain a little bit more.
ORa- 01427 single -row subquery returns more than one rowmeans that you have a subquery that Oracle is expecting one value from that is returning multiple values. In your case you need one value for the equijoin ("=") and you are getting more than one value back. The error happens even if all the values are the same - multiple values being returned will cause the error.
The solution is to either allow multiple values to be returned (say, use the IN condition istead of "=") or only return one value if possible (say, forcing one value by using DISTINCT, GROUP BY, or a WHERE clause condition of ROWNUM=1) - but these workarounds must be checked carefully to make sure they work correctkly

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