These are the ones I used most. But if I have attributes in a specific procedure, (i.e. let's say I'm calling an LDAP procedure) for those variables I'll append l_ to it, just to separate them.
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I work in Oracle, so I'll explain my variable types:
Varchar2: v_thisIsVarchar2
Number: n_thisIsNumber
Clob: c_imAClob
Blob: b_imABlob
Date: d_imADate
Raw: r_imRaw
These are the ones I used most. But if I have attributes in a specific procedure, (i.e. let's say I'm calling an LDAP procedure) for those variables I'll append l_ to it, just to separate them.