SQL or syntax

Use the or syntax in 1.mysql, or use note points in MySQL syntax. Project encountered pit, traverse the issue of reward data query Error!!!

  $sql = ' SELECT                 *             from                 ' Vvt_spread_doubleegg_exchange_award ' as P            WHERE                p. ' Act_type ' = 4 or P. ' Act_ Type ' = 5            and                p. ' user_id ' = '. $user _id            ;

The or syntax in SQL is typically used for queries of multiple conditions, the equivalent of the syntax query above: Two data sets that are queried by SQL.

  $sql = ' SELECT *  from  ' Vvt_spread_doubleegg_exchange_award ' as P WHERE  p. ' Act_type ' = 4;
  $sql = ' SELECT * from ' Vvt_spread_doubleegg_exchange_award ' as P WHERE  p. ' Act_type ' = 5 and P. ' user_id ' = '. $user _id;

2. To query Act_type = 4 and user_id = 11123 or Equal to P. ' Act_type ' = 5 and user_id = 11123 The data set or both sides of the condition must be added ().

  $sql = ' SELECT                 *             from                 ' Vvt_spread_doubleegg_exchange_award ' as P            WHERE                (p. ' Act_type ' = 4 or P . ' Act_type ' = 5)            and                p. ' user_id ' = '. $user _id            ;

SQL or syntax